Add empty template database for clean project setup

- Create sources.template.db with empty tables but proper schema
- Update .gitignore to track template database while ignoring local databases
- Allows users to copy template and configure FILE_DIRECTORY for their local setup
- Prevents accidental commits of local development data

🤖 Generated with [Claude Code](https://claude.ai/code)

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

.gitignore

@@ -86,6 +86,8 @@ logs
 files/*.db
 files/*.sqlite
 files/*.sqlite3
+# But include template database
+!files/*.template.db
 
 # OS generated files
 .DS_Store