feat(leads): add lead pipeline, keyword/status mapping, and encoding fixes
- Add lead ingestion, review queue, and keyword/status management
- Add DB schema: leads, service_keywords, lead_statuses, processed_messages
- Add migration with default keyword/status seeding per client
- Fix SQLite read/write deadlock in sanitizeEncoding
- Fix UTF-8 corruption: replace byte-iterating replaceAll with strings.ReplaceAll
- Add utf8.ValidString guard to decodeLatin1 to avoid double-encoding
- Remove hardcoded internal-secret; use config.InternalSecret() everywhere
- Add .gitignore for binaries, SQLite DBs, build artifacts, WhatsApp sessions
gabspereira
57920d45d6