Add SQLite support for local development

[TaprootFreak]

Summary

This PR adds SQLite database support for local development while maintaining MSSQL for dev/prod environments.

Changes

• Database Configuration: Environment-based database selection

  • ENVIRONMENT=loc → SQLite (local development)
  • ENVIRONMENT=dev|prd → MSSQL (existing production setup)

• Dependencies: Added sqlite3 package as devDependency (not installed in production)

• Entity Updates: Updated column type definitions for cross-database compatibility

  • length: 'MAX' / nvarchar(max) → type: 'text' for SQLite compatibility
  • datetime2 → datetime for SQLite compatibility
  • type: 'float' for decimal numbers
  • No impact on prd: SQL_SYNCHRONIZE=false prevents schema changes, runtime queries are unaffected

• Graceful degradation for local environment (all guarded by Environment.LOC):

  • Lightning WebSocket connections skipped
  • Alchemy webhook initialization skipped
  • EVM payment webhook setup skipped
  • CitreaClient wallet creation skipped
  • In dev/prd, missing config still fails loudly at startup (no silent failures)

• Gitignore: Added testDB/ and SQLite database files

Local Development Setup

# 1. Create .env in api root
ENVIRONMENT=loc
PORT=3000
SQL_DB=testDB/lightning_space.db
SQL_SYNCHRONIZE=true
SQL_MIGRATE=false
JWT_SECRET=<any-string>
DISABLED_PROCESSES=*

# 2. Install, build & start
npm install && npm run build && npm run start

API available at http://localhost:3000/v1, Swagger at http://localhost:3000/swagger.

Production Safety

• All local-only code paths are explicitly guarded by Environment.LOC checks
• MSSQL database config block is completely unchanged for dev/prd
• Entity column type changes only affect DDL (not runtime queries), and SQL_SYNCHRONIZE=false in prd prevents any schema modifications
• sqlite3 is a devDependency — not installed in production builds
• No business logic changes

Testing

• Lint, build and all tests pass
• Local development tested with SQLite
• Existing dev/prd environments remain unchanged

Breaking Changes

None. Backward compatible, only affects local development when ENVIRONMENT=loc.

[TaprootFreak]

Do not use Squash