feat(api): integrate Better Auth with Drizzle adapter and social providers

- Add Better Auth config with Google + GitHub social providers
- Mount auth handler on /api/auth/* in Express
- Generate and migrate auth tables (user, session, account, verification)
- Deduplicate term_glosses data for tighter unique constraint
- Drop legacy users table

documentation/notes.md

@@ -5,6 +5,54 @@
 - pinning dependencies in package.json files
 - rethink organisation of datafiles and wordlists
 
+## problems+thoughts
+
+### resolve deps problem
+
+﬌ pnpm --filter web add better-auth
+ WARN  2 deprecated subdependencies found: @esbuild-kit/core-utils@3.3.2, @esbuild-kit/esm-loader@2.6.5
+Progress: resolved 577, reused 0, downloaded 0, added 0, done
+ WARN  Issues with peer dependencies found
+.
+└─┬ eslint-plugin-react-hooks 7.0.1
+  └── ✕ unmet peer eslint@"^3.0.0 || ^4.0.0 || ^5.0.0 || ^6.0.0 || ^7.0.0 || ^8.0.0-0 || ^9.0.0": found 10.0.3
+.                                        |   +3 +
+Done in 5.6s using pnpm v10.33.0
+
+### env managing
+
+using env files is not uptodate, use a modern, proper approach
+
+### apple login
+
+add option to login with apple accounts
+
+### mail login
+
+add option to login with email+pw
+
+### google login
+
+credentials are saved in Downloads/lila/ json file
+
+app publication/verification:
+
+Branding and Data Access (Scope) Verification
+
+In addition to brand verification, your app may also need to be verified to use certain scopes.  You can view and track this on the Verification Center page:
+
+    Branding status: This tracks the verification of your app's public-facing brand (name, logo, etc.).
+    Data access status: This tracks the verification of the specific data (scopes) your app is requesting to access.
+
+Note: You must have a published branding status before you can request verification for data access (scopes).
+Manage App Audience Configuration
+Publishing Status
+Manage your app publishing status in the Audience page of the Google Auth Platform. 
+User Type
+Manage your app audience in the Audience page of the Google Auth Platform. 
+
+[link](https://support.google.com/cloud/answer/15549049?visit_id=01775982668127-2568683599515917262&rd=1#publishing-status&zippy=%2Cpublishing-status%2Cuser-type)
+
 ## tipps
 
 - backend advice: [backend](https://github.com/MohdOwaisShah/backend)