Migrate authentication to Better Auth

Replace the hand-rolled JWT auth with Better Auth 1.6.25 httpOnly cookie
sessions, validated against the database on every request so revocation,
bans and role changes take effect immediately.

Backend:
- betterAuth.ts wires the Drizzle adapter, magic links, Google sign-in and
  the admin plugin; auth-schema.ts maps Better Auth's models onto the
  existing `users` table so user IDs and their foreign keys survive intact.
- routes/auth.ts is gone; Better Auth serves the standard endpoints and
  authExt.ts carries the flows it doesn't cover.
- auth.ts shrinks to session resolution and helpers; sessions/revocation in
  dashboard.ts now read and delete `auth_sessions` rows directly.
- Schema adds the Better Auth core + admin columns (email_verified, image,
  banned, ban_reason, ban_expires), with migrations and tests.
- rateLimit.ts resolves client IPs spoof-resistantly: proxy headers are only
  honoured from loopback/RFC1918 peers plus TRUSTED_PROXIES.
- passwordPolicy.ts centralises password validation.
- Bump drizzle-orm, drizzle-kit and better-sqlite3 to versions compatible
  with Better Auth.

Frontend:
- auth-client.ts plus a reworked AuthContext and api/client.ts move to
  cookie-based sessions; no more bearer tokens in requests or middleware.

photo-api:
- Validate Better Auth session cookies against the shared auth_sessions
  table instead of verifying JWTs; JWT_SECRET is no longer needed for user
  auth, and PHOTO_VIEW_SECRET now signs gallery view tokens.

BETTER_AUTH_SECRET and BETTER_AUTH_URL are required in production; the
deprecated JWT_SECRET stays only as the photo-api view-token fallback.

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

frontend/src/lib/api/media.ts

@@ -1,4 +1,4 @@
-import { fetchApi, API_BASE, getToken } from './client';
+import { fetchApi, API_BASE } from './client';
 import type { Media } from './types';
 
 export const mediaApi = {
@@ -11,16 +11,15 @@ export const mediaApi = {
   },
 
   upload: async (file: File, relatedId?: string, relatedType?: string) => {
-    const token = getToken();
-
     const formData = new FormData();
     formData.append('file', file);
     if (relatedId) formData.append('relatedId', relatedId);
     if (relatedType) formData.append('relatedType', relatedType);
 
+    // Auth rides on the session cookie
     const res = await fetch(`${API_BASE}/api/media/upload`, {
       method: 'POST',
-      headers: token ? { 'Authorization': `Bearer ${token}` } : {},
+      credentials: API_BASE ? 'include' : 'same-origin',
       body: formData,
     });