Fixed silent connection initiation failures where HTTP errors were caught
but success was returned to the user, leaving zombie connections in
PENDING state forever.
Changes:
- Delete failed connection from database when HTTP request fails
- Throw BadRequestException with clear error message
- Added test to verify connection deletion and exception throwing
- Import BadRequestException in connection.service.ts
User Impact:
- Users now receive immediate feedback when connection initiation fails
- No more zombie connections stuck in PENDING state
- Clear error messages indicate the reason for failure
Testing:
- Added test case: "should delete connection and throw error if request fails"
- All 21 connection service tests passing
- Quality gates: lint, typecheck, build all passing
Fixes#275
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
