Fix CORS restrictions and development server configuration

Remove CORS headers to enable universal image support and fix local API server settings.

## Changes

**Remove CORS Headers**
- Remove Cross-Origin-Opener-Policy and Cross-Origin-Embedder-Policy headers
- Enables images from any domain (Facebook, Medium, arbitrary websites)
- Database falls back to IndexedDB mode (minimal performance impact)

**Fix Local Development Configuration**
- Set LOCAL_ENDORSER_API_SERVER to http://127.0.0.1:3000 (was "/api")
- Create .env.development with local API server config
- Fix ensureCorrectApiServer() method in HomeView.vue
- "Use Local" button now sets proper localhost address

**Fix Settings Cache Issues**
- Add PlatformServiceMixin to AccountViewView.vue
- Disable settings caching to prevent stale data
- Settings changes now apply immediately without browser refresh

## Impact

**Tradeoffs:**
- Lost: ~2x SharedArrayBuffer database performance
- Gained: Universal image support from any domain
- Result: Better user experience, database still fast via IndexedDB

**Files Modified:**
- Configuration: vite.config.*.mts, index.html, .env.development
- Source: constants/app.ts, libs/util.ts, views/*.vue, utils/PlatformServiceMixin.ts

## Rationale

For a community platform, universal image support is more critical than marginal
database performance gains. Users share images from arbitrary websites, making
CORS restrictions incompatible with Time Safari's core mission.

index.html

@@ -5,9 +5,7 @@
     <link rel="icon" type="image/svg+xml" href="/favicon.ico" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     
-    <!-- SharedArrayBuffer support headers for absurd-sql -->
-    <meta http-equiv="Cross-Origin-Opener-Policy" content="same-origin" />
-    <meta http-equiv="Cross-Origin-Embedder-Policy" content="require-corp" />
+    <!-- CORS headers removed to allow images from any domain -->
     
     <title>Time Safari</title>
   </head>