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)

build.py

@@ -294,6 +294,10 @@ def build_soleprint(output_dir: Path, room: str):
         if source.exists():
             copy_path(source, output_dir / system)
 
+    # Common modules (auth, etc)
+    if (soleprint / "common").exists():
+        copy_path(soleprint / "common", output_dir / "common")
+
     # Room config (includes merging room-specific artery/atlas/station)
     copy_cfg(output_dir, room)