refactor: Phase 7-2 Complete - Full Inquiry page API-First migration

**Blockers Fixed:**

1. InquiryBrowserClient URL hardcoding
   - Removed: \"http://localhost:5001\" hardcoded in each method
   - Added: Configured BaseAddress in Program.cs
   - Now uses: Relative paths (\"inquiry\", \"inquiry/{id}\", etc)
   - HttpClientFactory pipeline includes TokenRefreshHandler

2. Missing API endpoints in InquiryController
   - Added: PUT /api/inquiry/{id}/memo
   - Added: POST /api/inquiry/{id}/convert-to-client
   - Request DTOs: UpdateAdminMemoRequest, ConvertToClientRequest
   - ClientService injected (for client creation)

**Implementation:**

- InquiryBrowserClient: Extended interface
   * UpdateAdminMemoAsync(id, memo)
   * ConvertToClientAsync(id, name, phone, serviceType)
   * All methods use relative paths

- InquiryBrowserClient.ConvertToClientResponse
   * Deserialize API response to extract clientId

- InquiryDetail.razor: Full refactor
   * Before: @inject InquiryService, ClientService (direct service calls)
   * After: @inject IInquiryBrowserClient (API-only)
   * OnInitializedAsync: InquiryClient.GetByIdAsync
   * OnStatusChanged: InquiryClient.UpdateStatusAsync
   * SaveMemo: InquiryClient.UpdateAdminMemoAsync
   * ConvertToClient: InquiryClient.ConvertToClientAsync

**InquiryList.razor status:**
   * Also still injects IInquiryRepository (line 4)
   * Consider refactoring to use IInquiryBrowserClient for consistency

**Phase 7 Status:**
- ✅ Blog page: Already API-First (ApiClient)
- ✅ Inquiry page: Fully API-First (IInquiryBrowserClient)
  * InquiryTable: ✅ Migrated
  * InquiryDetail: ✅ Migrated
  * InquiryList: ⏳ Still uses IInquiryRepository (minor - reads only)

**SOLID Applied:**
✓ S: InquiryBrowserClient single responsibility
✓ D: Blazor → IInquiryBrowserClient (not ServiceLayer)
✓ O: Client can change without Blazor impact

Next: Check FAQ, Client, TaxFiling pages for same pattern.
If all still injecting services directly, migrate sequentially.
Then: Phase 6 (SignalR) will have all pages ready.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

TaxBaik.Web/Services/InquiryBrowserClient.cs

@@ -13,6 +13,8 @@ public interface IInquiryBrowserClient
     Task<(IEnumerable<Inquiry> Items, int Total)> GetPagedAsync(int page = 1, int pageSize = 20, CancellationToken ct = default);
     Task<Inquiry?> GetByIdAsync(int id, CancellationToken ct = default);
     Task<bool> UpdateStatusAsync(int id, string status, CancellationToken ct = default);
+    Task<bool> UpdateAdminMemoAsync(int id, string adminMemo, CancellationToken ct = default);
+    Task<int> ConvertToClientAsync(int id, string name, string phone, string serviceType, CancellationToken ct = default);
 }
 
 public class InquiryBrowserClient : IInquiryBrowserClient
@@ -32,7 +34,7 @@ public class InquiryBrowserClient : IInquiryBrowserClient
         try
         {
             var result = await _http.GetFromJsonAsync<InquiryPagedResponse>(
-                $"http://localhost:5001/taxbaik/api/inquiry?page={page}&pageSize={pageSize}",
+                $"inquiry?page={page}&pageSize={pageSize}",
                 cancellationToken: ct);
 
             return result != null
@@ -51,7 +53,7 @@ public class InquiryBrowserClient : IInquiryBrowserClient
         try
         {
             return await _http.GetFromJsonAsync<Inquiry>(
-                $"http://localhost:5001/taxbaik/api/inquiry/{id}",
+                $"inquiry/{id}",
                 cancellationToken: ct);
         }
         catch (HttpRequestException ex)
@@ -67,7 +69,7 @@ public class InquiryBrowserClient : IInquiryBrowserClient
         {
             var request = new { status };
             var response = await _http.PutAsJsonAsync(
-                $"http://localhost:5001/taxbaik/api/inquiry/{id}/status",
+                $"inquiry/{id}/status",
                 request,
                 cancellationToken: ct);
 
@@ -80,6 +82,51 @@ public class InquiryBrowserClient : IInquiryBrowserClient
         }
     }
 
+    public async Task<bool> UpdateAdminMemoAsync(int id, string adminMemo, CancellationToken ct = default)
+    {
+        try
+        {
+            var request = new { adminMemo };
+            var response = await _http.PutAsJsonAsync(
+                $"inquiry/{id}/memo",
+                request,
+                cancellationToken: ct);
+
+            return response.IsSuccessStatusCode;
+        }
+        catch (HttpRequestException ex)
+        {
+            _logger.LogError(ex, "Failed to update inquiry {InquiryId} memo", id);
+            throw;
+        }
+    }
+
+    public async Task<int> ConvertToClientAsync(int id, string name, string phone, string serviceType, CancellationToken ct = default)
+    {
+        try
+        {
+            var response = await _http.PostAsJsonAsync(
+                $"inquiry/{id}/convert-to-client",
+                new { name, phone, serviceType },
+                cancellationToken: ct);
+
+            if (!response.IsSuccessStatusCode)
+                return 0;
+
+            var content = await response.Content.ReadAsStringAsync(ct);
+            var result = System.Text.Json.JsonSerializer.Deserialize<ConvertToClientResponse>(
+                content,
+                new System.Text.Json.JsonSerializerOptions { PropertyNameCaseInsensitive = true });
+
+            return result?.ClientId ?? 0;
+        }
+        catch (HttpRequestException ex)
+        {
+            _logger.LogError(ex, "Failed to convert inquiry {InquiryId} to client", id);
+            throw;
+        }
+    }
+
     private class InquiryPagedResponse
     {
         public List<Inquiry> Data { get; set; } = [];
@@ -87,4 +134,9 @@ public class InquiryBrowserClient : IInquiryBrowserClient
         public int Page { get; set; }
         public int PageSize { get; set; }
     }
+
+    private class ConvertToClientResponse
+    {
+        public int ClientId { get; set; }
+    }
 }