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/claude-sdk.js

@@ -378,6 +378,11 @@ async function queryClaudeSDK(command, options = {}, ws) {
         capturedSessionId = message.session_id;
         addSession(capturedSessionId, queryInstance, tempImagePaths, tempDir);
 
+        // Set session ID on writer
+        if (ws.setSessionId && typeof ws.setSessionId === 'function') {
+          ws.setSessionId(capturedSessionId);
+        }
+
         // Send session-created event only once for new sessions
         if (!sessionId && !sessionCreatedSent) {
           sessionCreatedSent = true;