feat: add web UI with login, CRUD, admin, and API key management

- Add login page with JWT authentication
- Add dashboard with stats and quick actions
- Add links management page (full CRUD with search)
- Add collections management page
- Add API key management page with copy-to-clipboard
- Add admin user management page (admin only)
- Fix UUID type mismatches across all endpoints
- Add updated_at column to api_keys and audit_log in schema.sql
- Fix DB_PASSWORD default in docker-compose.yml
- Add PyJWT to requirements.txt
- Fix API docs URL (/docs instead of /api/docs)
- Improve JS error handling (show actual messages)
- Rewrite conftest.py with proper DB lifecycle management
- Add 42 new integration tests (84 total, all passing)
  - test_admin.py: 15 tests for admin endpoints
  - test_auth_extended.py: 9 tests for API key CRUD
  - test_tags.py: 12 tests for tag endpoints
  - test_sync.py: 6 tests for sync endpoints

LinkSyncServer/app.py

@@ -3,10 +3,11 @@ LinkSyncServer - Main Application
 """
 
 import os
-from fastapi import FastAPI
+from fastapi import FastAPI, Request
 from fastapi.middleware.cors import CORSMiddleware
 from fastapi.staticfiles import StaticFiles
 from fastapi.templating import Jinja2Templates
+from fastapi.responses import RedirectResponse
 from contextlib import asynccontextmanager
 
 from api.routes import router as api_router
@@ -51,5 +52,35 @@ def health():
 
 
 @app.get("/")
-def index(request):
-    return templates.TemplateResponse("index.html", {"request": request})
+def index():
+    return RedirectResponse(url="/login")
+
+
+@app.get("/login")
+def login_page(request: Request):
+    return templates.TemplateResponse("login.html", {"request": request})
+
+
+@app.get("/dashboard")
+def dashboard(request: Request):
+    return templates.TemplateResponse("dashboard.html", {"request": request})
+
+
+@app.get("/links")
+def links_page(request: Request):
+    return templates.TemplateResponse("links.html", {"request": request})
+
+
+@app.get("/collections")
+def collections_page(request: Request):
+    return templates.TemplateResponse("collections.html", {"request": request})
+
+
+@app.get("/api-keys")
+def apikeys_page(request: Request):
+    return templates.TemplateResponse("apikeys.html", {"request": request})
+
+
+@app.get("/admin")
+def admin_page(request: Request):
+    return templates.TemplateResponse("admin.html", {"request": request})