fix: per-page WASM render mode, Contact checkbox binding, Telegram inquiry channel

- Admin: replace the global @rendermode on <Routes>/<Router> with per-page
  render mode. Login.razor now prerenders (form visible before WASM loads);
  every other [Authorize] page stays prerender: false to avoid the
  AuthorizeRouteView blank-render regression from earlier attempts. Adds a
  "준비 중" -> "로그인" splash tied to WASM boot completion, and lets the
  authenticated-shell loading overlay stay up until AdminShell actually renders.
- Contact.cshtml: fix the "Agree" checkbox missing value="true" - a checked
  box sent the browser-default "on", which bool model binding can't parse,
  so ModelState.IsValid silently went false and OnPostAsync returned a blank
  form with no visible error on every submission. Validation summary widened
  from ModelOnly to All so this class of failure isn't silent again.
- TelegramInquiryNotificationService: read Telegram:InquiryChatId (falling
  back to ChatId) instead of only ChatId, matching the channel routing
  CLAUDE.md documents and deploy.yml already provisions as separate secrets.
- Reconcile CLAUDE.md's self-contradicting Phase 8 prerender notes (Phase 9),
  rewrite validate_admin_render.sh for the per-page design, and add a
  SmartAdmin 5.5 design reference section to DOUZONE_UX_GUIDE.md for future
  admin screens (existing screens unchanged, tracked as WBS P4-03).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

TaxBaik.Web.Client/Components/Admin/Pages/AdminIndex.razor

@@ -1,5 +1,5 @@
 @page "/admin"
-@rendermode InteractiveWebAssembly
+@rendermode @(new InteractiveWebAssemblyRenderMode(prerender: false))
 @attribute [Authorize]
 @inject NavigationManager NavigationManager
 

TaxBaik.Web.Client/Components/Admin/Pages/Announcements/AnnouncementEdit.razor

@@ -1,6 +1,6 @@
 @page "/admin/announcements/create"
 @page "/admin/announcements/{Id:int}/edit"
-@rendermode InteractiveWebAssembly
+@rendermode @(new InteractiveWebAssemblyRenderMode(prerender: false))
 @attribute [Authorize]
 @using TaxBaik.Application.DTOs
 @using TaxBaik.Web.Services

TaxBaik.Web.Client/Components/Admin/Pages/Announcements/AnnouncementList.razor

@@ -1,5 +1,5 @@
 @page "/admin/announcements"
-@rendermode InteractiveWebAssembly
+@rendermode @(new InteractiveWebAssemblyRenderMode(prerender: false))
 @attribute [Authorize]
 @using TaxBaik.Web.Services
 @using TaxBaik.Domain.Entities

TaxBaik.Web.Client/Components/Admin/Pages/Blog/BlogCreate.razor

@@ -1,5 +1,5 @@
 @page "/admin/blog/create"
-@rendermode InteractiveWebAssembly
+@rendermode @(new InteractiveWebAssemblyRenderMode(prerender: false))
 @attribute [Authorize]
 @using TaxBaik.Application.DTOs
 @using TaxBaik.WasmClient.Components.Admin.Pages.Blog

TaxBaik.Web.Client/Components/Admin/Pages/Blog/BlogEdit.razor

@@ -1,5 +1,5 @@
 @page "/admin/blog/{id:int}/edit"
-@rendermode InteractiveWebAssembly
+@rendermode @(new InteractiveWebAssemblyRenderMode(prerender: false))
 @attribute [Authorize]
 @using TaxBaik.Application.DTOs
 @using TaxBaik.WasmClient.Components.Admin.Pages.Blog

TaxBaik.Web.Client/Components/Admin/Pages/Blog/BlogList.razor

@@ -1,5 +1,5 @@
 @page "/admin/blog"
-@rendermode InteractiveWebAssembly
+@rendermode @(new InteractiveWebAssemblyRenderMode(prerender: false))
 @attribute [Authorize]
 @inject IBlogBrowserClient BlogClient
 @inject ISnackbar Snackbar

TaxBaik.Web.Client/Components/Admin/Pages/Clients/ClientDetail.razor

@@ -1,5 +1,5 @@
 @page "/admin/clients/{ClientId:int}"
-@rendermode InteractiveWebAssembly
+@rendermode @(new InteractiveWebAssemblyRenderMode(prerender: false))
 @attribute [Authorize]
 @using TaxBaik.Web.Services
 @using TaxBaik.Web.Services.AdminClients

TaxBaik.Web.Client/Components/Admin/Pages/Clients/ClientEdit.razor

@@ -1,6 +1,6 @@
 @page "/admin/clients/create"
 @page "/admin/clients/{Id:int}/edit"
-@rendermode InteractiveWebAssembly
+@rendermode @(new InteractiveWebAssemblyRenderMode(prerender: false))
 @attribute [Authorize]
 @using TaxBaik.Application.DTOs
 @using TaxBaik.Web.Services

TaxBaik.Web.Client/Components/Admin/Pages/Clients/ClientList.razor

@@ -1,5 +1,5 @@
 @page "/admin/clients"
-@rendermode InteractiveWebAssembly
+@rendermode @(new InteractiveWebAssemblyRenderMode(prerender: false))
 @attribute [Authorize]
 @using TaxBaik.Web.Services
 @using TaxBaik.Domain.Entities

TaxBaik.Web.Client/Components/Admin/Pages/CommonCodes.razor

@@ -1,5 +1,5 @@
 @page "/admin/common-codes"
-@rendermode InteractiveWebAssembly
+@rendermode @(new InteractiveWebAssemblyRenderMode(prerender: false))
 @using TaxBaik.Web.Services.AdminClients
 @using TaxBaik.Domain.Entities
 @attribute [Authorize]

TaxBaik.Web.Client/Components/Admin/Pages/Companies/CompanyCreate.razor

@@ -1,5 +1,5 @@
 @page "/admin/companies/create"
-@rendermode InteractiveWebAssembly
+@rendermode @(new InteractiveWebAssemblyRenderMode(prerender: false))
 @attribute [Authorize]
 @using TaxBaik.WasmClient.Components.Admin.Forms
 @inject IApiClient ApiClient

TaxBaik.Web.Client/Components/Admin/Pages/Companies/CompanyEdit.razor

@@ -1,5 +1,5 @@
 @page "/admin/companies/{id:int}/edit"
-@rendermode InteractiveWebAssembly
+@rendermode @(new InteractiveWebAssemblyRenderMode(prerender: false))
 @attribute [Authorize]
 @using TaxBaik.WasmClient.Components.Admin.Forms
 @inject IApiClient ApiClient

TaxBaik.Web.Client/Components/Admin/Pages/Companies/CompanyList.razor

@@ -1,5 +1,5 @@
 @page "/admin/companies"
-@rendermode InteractiveWebAssembly
+@rendermode @(new InteractiveWebAssemblyRenderMode(prerender: false))
 @attribute [Authorize]
 @inject IApiClient ApiClient
 @inject ISnackbar Snackbar

TaxBaik.Web.Client/Components/Admin/Pages/ConsultingActivities.razor

@@ -1,5 +1,5 @@
 @page "/admin/consulting-activities"
-@rendermode InteractiveWebAssembly
+@rendermode @(new InteractiveWebAssemblyRenderMode(prerender: false))
 @using TaxBaik.Web.Services.AdminClients
 @using TaxBaik.WasmClient.Components.Admin.Shared
 @inject IConsultingActivityBrowserClient ActivityClient

TaxBaik.Web.Client/Components/Admin/Pages/Contracts.razor

@@ -1,5 +1,5 @@
 @page "/admin/contracts"
-@rendermode InteractiveWebAssembly
+@rendermode @(new InteractiveWebAssemblyRenderMode(prerender: false))
 @using TaxBaik.Web.Services.AdminClients
 @using TaxBaik.WasmClient.Components.Admin.Shared
 @inject IContractBrowserClient ContractClient

TaxBaik.Web.Client/Components/Admin/Pages/Dashboard.razor

@@ -1,5 +1,5 @@
 @page "/admin/dashboard"
-@rendermode InteractiveWebAssembly
+@rendermode @(new InteractiveWebAssemblyRenderMode(prerender: false))
 @attribute [Authorize]
 @using TaxBaik.Web.Services
 @using TaxBaik.WasmClient.Components.Admin.Shared

TaxBaik.Web.Client/Components/Admin/Pages/Faqs/FaqEdit.razor

@@ -1,6 +1,6 @@
 @page "/admin/faqs/create"
 @page "/admin/faqs/{Id:int}/edit"
-@rendermode InteractiveWebAssembly
+@rendermode @(new InteractiveWebAssemblyRenderMode(prerender: false))
 @attribute [Authorize]
 @using TaxBaik.Web.Services
 @using TaxBaik.Domain.Entities

TaxBaik.Web.Client/Components/Admin/Pages/Faqs/FaqList.razor

@@ -1,5 +1,5 @@
 @page "/admin/faqs"
-@rendermode InteractiveWebAssembly
+@rendermode @(new InteractiveWebAssemblyRenderMode(prerender: false))
 @attribute [Authorize]
 @using TaxBaik.Web.Services
 @using TaxBaik.Domain.Entities

TaxBaik.Web.Client/Components/Admin/Pages/Inquiries/InquiryCreate.razor

@@ -1,5 +1,5 @@
 @page "/admin/inquiries/create"
-@rendermode InteractiveWebAssembly
+@rendermode @(new InteractiveWebAssemblyRenderMode(prerender: false))
 @attribute [Authorize]
 @using TaxBaik.Application.DTOs
 @using TaxBaik.WasmClient.Components.Admin.Forms

TaxBaik.Web.Client/Components/Admin/Pages/Inquiries/InquiryDetail.razor

@@ -1,5 +1,5 @@
 @page "/admin/inquiries/{InquiryId:int}"
-@rendermode InteractiveWebAssembly
+@rendermode @(new InteractiveWebAssemblyRenderMode(prerender: false))
 @attribute [Authorize]
 @using TaxBaik.Web.Services
 @inject IInquiryBrowserClient InquiryClient

TaxBaik.Web.Client/Components/Admin/Pages/Inquiries/InquiryEdit.razor

@@ -1,5 +1,5 @@
 @page "/admin/inquiries/{id:int}/edit"
-@rendermode InteractiveWebAssembly
+@rendermode @(new InteractiveWebAssemblyRenderMode(prerender: false))
 @attribute [Authorize]
 @using TaxBaik.Application.DTOs
 @using TaxBaik.WasmClient.Components.Admin.Forms

TaxBaik.Web.Client/Components/Admin/Pages/Inquiries/InquiryList.razor

@@ -1,5 +1,5 @@
 @page "/admin/inquiries"
-@rendermode InteractiveWebAssembly
+@rendermode @(new InteractiveWebAssemblyRenderMode(prerender: false))
 @attribute [Authorize]
 @using TaxBaik.Web.Services
 @inject IInquiryBrowserClient InquiryClient

TaxBaik.Web.Client/Components/Admin/Pages/Login.razor

@@ -1,6 +1,6 @@
 @page "/admin/login"
 @layout TaxBaik.WasmClient.Components.Admin.Layout.BlankLayout
 @attribute [AllowAnonymous]
-@rendermode InteractiveWebAssembly
+@rendermode @(new InteractiveWebAssemblyRenderMode(prerender: true))
 <PageTitle>로그인</PageTitle>
 <AdminLoginForm />

TaxBaik.Web.Client/Components/Admin/Pages/Logout.razor

@@ -1,5 +1,5 @@
 @page "/admin/logout"
-@rendermode InteractiveWebAssembly
+@rendermode @(new InteractiveWebAssemblyRenderMode(prerender: false))
 @using TaxBaik.Web.Services
 @inject CustomAuthenticationStateProvider AuthStateProvider
 @inject NavigationManager NavigationManager

TaxBaik.Web.Client/Components/Admin/Pages/RevenueTrackings.razor

@@ -1,5 +1,5 @@
 @page "/admin/revenue-trackings"
-@rendermode InteractiveWebAssembly
+@rendermode @(new InteractiveWebAssemblyRenderMode(prerender: false))
 @using TaxBaik.Web.Services.AdminClients
 @using TaxBaik.WasmClient.Components.Admin.Shared
 @inject IRevenueTrackingBrowserClient RevenueClient

TaxBaik.Web.Client/Components/Admin/Pages/SeasonSimulator.razor

@@ -1,5 +1,5 @@
 @page "/admin/season-simulator"
-@rendermode InteractiveWebAssembly
+@rendermode @(new InteractiveWebAssemblyRenderMode(prerender: false))
 @attribute [Authorize]
 @using TaxBaik.Application.Seasonal
 @using TaxBaik.Application.Services

TaxBaik.Web.Client/Components/Admin/Pages/Settings/SiteSettings.razor

@@ -1,5 +1,5 @@
 @page "/admin/settings"
-@rendermode InteractiveWebAssembly
+@rendermode @(new InteractiveWebAssemblyRenderMode(prerender: false))
 @attribute [Authorize]
 @using System.ComponentModel.DataAnnotations
 @using System.Collections.Generic

TaxBaik.Web.Client/Components/Admin/Pages/TaxFilingSchedules.razor

@@ -1,5 +1,5 @@
 @page "/admin/tax-filing-schedules"
-@rendermode InteractiveWebAssembly
+@rendermode @(new InteractiveWebAssemblyRenderMode(prerender: false))
 @using TaxBaik.Web.Services.AdminClients
 @using TaxBaik.Domain.Entities
 @using TaxBaik.WasmClient.Components.Admin.Shared

TaxBaik.Web.Client/Components/Admin/Pages/TaxFilings/TaxFilingList.razor

@@ -1,5 +1,5 @@
 @page "/admin/tax-filings"
-@rendermode InteractiveWebAssembly
+@rendermode @(new InteractiveWebAssemblyRenderMode(prerender: false))
 @attribute [Authorize]
 @using TaxBaik.Web.Services
 @using TaxBaik.Domain.Entities

TaxBaik.Web.Client/Components/Admin/Pages/TaxProfiles.razor

@@ -1,5 +1,5 @@
 @page "/admin/tax-profiles"
-@rendermode InteractiveWebAssembly
+@rendermode @(new InteractiveWebAssemblyRenderMode(prerender: false))
 @using TaxBaik.Web.Services.AdminClients
 @using TaxBaik.WasmClient.Components.Admin.Shared
 @inject ITaxProfileBrowserClient TaxProfileClient