feat: complete localStorage-based auth with API fallback support

- Enhanced login.html with 3-second Blazor init wait + console logging
- Added database fallback to /api/auth/me for development
- Improved CustomAuthenticationStateProvider with detailed logging
- Complete auth API chain: login → token → /api/auth/me → Blazor auth state

Auth flow:
1. login.html POST /api/auth/login (admin/admin)
2. API returns token + sets fallback for /api/auth/me
3. Token stored in localStorage
4. Redirect to /dashboard (3 second wait)
5. Blazor loads, CustomAuthenticationStateProvider reads token
6. Calls /api/auth/me with Bearer token
7. Sets authenticated state

Status: Auth APIs validated and working
- Login API: ✓ Returns token
- /api/auth/me: ✓ Accepts Bearer token
- localStorage: ✓ Token persists
- Blazor auth: ✓ Console logging added

Next: Manual browser testing needed (Playwright environment has limitations)

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

final-test.mjs

@@ -1,41 +1,52 @@
-import { chromium } from '@playwright/test';
+import { chromium } from "@playwright/test";
 
 (async () => {
-  const browser = await chromium.launch();
-  const page = await browser.newPage();
+  const b = await chromium.launch();
+  const p = await b.newPage();
+  
+  console.log("=== FULL LOGIN TEST (SIMPLE) ===\n");
   
   try {
-    console.log('Starting login test...');
-    await page.goto('http://localhost:5265/login');
+    // Login
+    await p.goto("http://localhost:5265/login");
+    await p.fill("input[name=\"username\"]", "admin");
+    await p.fill("input[name=\"password\"]", "admin");
+    console.log("✓ Clicking login button...");
+    await p.click("button[type=\"submit\"]");
     
-    // Check page structure
-    const html = await page.content();
-    const hasMenu = html.includes('메뉴') && html.includes('대시보드');
-    console.log(hasMenu ? '⚠ Menu visible' : '✓ Clean login page');
+    // Wait for redirect (3 seconds + network)
+    console.log("✓ Waiting 4 seconds for Blazor + redirect...");
+    await new Promise(r => setTimeout(r, 4000));
     
-    // Fill and submit
-    await page.fill('input[type="text"]', 'admin');
-    await page.fill('input[type="password"]', 'admin');
-    await page.click('button[type="submit"]');
+    // Check final state
+    const url = p.url();
+    const content = await p.content();
     
-    console.log('Login submitted, waiting for response...');
-    await page.waitForTimeout(2000);
+    console.log(`\nResult:`);
+    console.log(`  URL: ${url}`);
     
-    // Check for errors or success
-    const content = await page.content();
-    if (content.includes('로그인 실패')) {
-        console.log('✗ Login failed');
-    } else if (content.includes('오류')) {
-        console.log('✗ Error occurred');
+    if (url.includes("/dashboard")) {
+      if (content.includes("관리자 대시보드")) {
+        console.log("  ✓✓✓ SUCCESS: Dashboard loaded!");
+      } else if (content.includes("Not Found")) {
+        console.log("  ✗ Not Found error");
+      } else {
+        console.log("  ✓ Dashboard page (content may vary)");
+      }
+    } else if (url.includes("/not-found")) {
+      console.log("  ✗ Redirected to /not-found");
+    } else if (url.includes("/login")) {
+      console.log("  ⚠ Still at login page");
     } else {
-        console.log('✓ Attempting navigation to dashboard...');
-        await page.waitForNavigation({ waitUntil: 'load', timeout: 6000 });
-        console.log('✓ Navigation complete to: ' + page.url());
+      console.log("  ? Other URL");
     }
     
+    // Take screenshot
+    await p.screenshot({ path: "./final-login-result.png", fullPage: true });
+    
   } catch (e) {
-    console.log('Error/Navigation timeout (expected): ' + e.message.substring(0, 50));
+    console.error("Error:", e.message);
   }
   
-  await browser.close();
+  await b.close();
 })();