fix: resolve email database permission errors for multi-user setups

Issues:
1. User directories created with chmod 770 (too restrictive)
   - Prevents service user from reading/writing even though in group
   - Changed to chmod 775 (recursive) to allow group access

2. openEmailDb tries to chmod file it may not own
   - If file owned by different user (e.g., andrepadez), chmod fails
   - Wrapped chmodSync in try/catch to gracefully skip

Changes:
- src/servers/api/users/provision.ts:
  * Changed chmod 770 → 775 (owner/group rwx, others rx)
  * Applied recursively to all subdirectories
  * Added chmod after seeding files to ensure consistency

- src/servers/api/email/email-db.ts:
  * Wrapped chmodSync in try/catch
  * Logs silently skip if file not owned by current process
  * Database still works even if chmod fails

Fixes /email endpoint 500 errors for users with email data.

src/servers/api/email/email-db.ts

@@ -82,7 +82,12 @@ export function openEmailDb(email: string): Database {
   db.exec(SCHEMA_TABLES);
   migrate(db);
   db.exec(SCHEMA_INDEXES);
-  chmodSync(dbPath, 0o666);
+  // Try to chmod, but don't crash if permission denied (e.g., file owned by different user)
+  try {
+    chmodSync(dbPath, 0o666);
+  } catch (err) {
+    // File exists with correct permissions, or owned by another user - that's fine
+  }
   return db;
 }