refactor: unified google vein, prefixed module loading, cfg separation

- Unified google vein with OAuth + Sheets API
- Prefixed vein module loading (vein_google) to avoid pip package shadowing
- Preload pip packages before vein loading
- Added common/auth framework
- Rebranded sbwrapper from Pawprint to Soleprint
- Removed cfg/ from history (now separate repo)
- Keep cfg/standalone/ as sample configuration
- gitignore cfg/amar/ and cfg/dlt/ (private configs)

.gitignore

@@ -12,5 +12,7 @@ venv/
 # Generated runnable instance (entirely gitignored - regenerate with build.py)
 gen/
 
-# Database dumps (sensitive data)
-cfg/*/dumps/*.sql
+# Room configurations (separate repo - contains credentials and room-specific data)
+# Keep cfg/standalone/ as sample, ignore actual rooms
+cfg/amar/
+cfg/dlt/