feat(api): add API for one-shot prompt generatio, key authentication system and git commit message generation

Implement comprehensive API key management functionality including
generation, validation, and CRUD operations.

Changes:
- Add API key database schema and operations (create, validate, delete,
  toggle)
- Generating a commit message will now work properly with claude sdk and cursor cli and return a suggested commit message
- Implement crypto-based key generation with 'ck_' prefix
- Add session ID tracking in claude-sdk.js and cursor-cli.js
- Update database layer with API key validation and last_used tracking
- Support multi-user API key management with user association

This enables secure programmatic access to the agent service

server/cursor-cli.js

@@ -94,6 +94,11 @@ async function spawnCursor(command, options = {}, ws) {
                     activeCursorProcesses.set(capturedSessionId, cursorProcess);
                   }
                   
+                  // Set session ID on writer (for API endpoint compatibility)
+                  if (ws.setSessionId && typeof ws.setSessionId === 'function') {
+                    ws.setSessionId(capturedSessionId);
+                  }
+
                   // Send session-created event only once for new sessions
                   if (!sessionId && !sessionCreatedSent) {
                     sessionCreatedSent = true;