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/routes/settings.js

@@ -0,0 +1,178 @@
+import express from 'express';
+import { apiKeysDb, credentialsDb } from '../database/db.js';
+
+const router = express.Router();
+
+// ===============================
+// API Keys Management
+// ===============================
+
+// Get all API keys for the authenticated user
+router.get('/api-keys', async (req, res) => {
+  try {
+    const apiKeys = apiKeysDb.getApiKeys(req.user.id);
+    // Don't send the full API key in the list for security
+    const sanitizedKeys = apiKeys.map(key => ({
+      ...key,
+      api_key: key.api_key.substring(0, 10) + '...'
+    }));
+    res.json({ apiKeys: sanitizedKeys });
+  } catch (error) {
+    console.error('Error fetching API keys:', error);
+    res.status(500).json({ error: 'Failed to fetch API keys' });
+  }
+});
+
+// Create a new API key
+router.post('/api-keys', async (req, res) => {
+  try {
+    const { keyName } = req.body;
+
+    if (!keyName || !keyName.trim()) {
+      return res.status(400).json({ error: 'Key name is required' });
+    }
+
+    const result = apiKeysDb.createApiKey(req.user.id, keyName.trim());
+    res.json({
+      success: true,
+      apiKey: result
+    });
+  } catch (error) {
+    console.error('Error creating API key:', error);
+    res.status(500).json({ error: 'Failed to create API key' });
+  }
+});
+
+// Delete an API key
+router.delete('/api-keys/:keyId', async (req, res) => {
+  try {
+    const { keyId } = req.params;
+    const success = apiKeysDb.deleteApiKey(req.user.id, parseInt(keyId));
+
+    if (success) {
+      res.json({ success: true });
+    } else {
+      res.status(404).json({ error: 'API key not found' });
+    }
+  } catch (error) {
+    console.error('Error deleting API key:', error);
+    res.status(500).json({ error: 'Failed to delete API key' });
+  }
+});
+
+// Toggle API key active status
+router.patch('/api-keys/:keyId/toggle', async (req, res) => {
+  try {
+    const { keyId } = req.params;
+    const { isActive } = req.body;
+
+    if (typeof isActive !== 'boolean') {
+      return res.status(400).json({ error: 'isActive must be a boolean' });
+    }
+
+    const success = apiKeysDb.toggleApiKey(req.user.id, parseInt(keyId), isActive);
+
+    if (success) {
+      res.json({ success: true });
+    } else {
+      res.status(404).json({ error: 'API key not found' });
+    }
+  } catch (error) {
+    console.error('Error toggling API key:', error);
+    res.status(500).json({ error: 'Failed to toggle API key' });
+  }
+});
+
+// ===============================
+// Generic Credentials Management
+// ===============================
+
+// Get all credentials for the authenticated user (optionally filtered by type)
+router.get('/credentials', async (req, res) => {
+  try {
+    const { type } = req.query;
+    const credentials = credentialsDb.getCredentials(req.user.id, type || null);
+    // Don't send the actual credential values for security
+    res.json({ credentials });
+  } catch (error) {
+    console.error('Error fetching credentials:', error);
+    res.status(500).json({ error: 'Failed to fetch credentials' });
+  }
+});
+
+// Create a new credential
+router.post('/credentials', async (req, res) => {
+  try {
+    const { credentialName, credentialType, credentialValue, description } = req.body;
+
+    if (!credentialName || !credentialName.trim()) {
+      return res.status(400).json({ error: 'Credential name is required' });
+    }
+
+    if (!credentialType || !credentialType.trim()) {
+      return res.status(400).json({ error: 'Credential type is required' });
+    }
+
+    if (!credentialValue || !credentialValue.trim()) {
+      return res.status(400).json({ error: 'Credential value is required' });
+    }
+
+    const result = credentialsDb.createCredential(
+      req.user.id,
+      credentialName.trim(),
+      credentialType.trim(),
+      credentialValue.trim(),
+      description?.trim() || null
+    );
+
+    res.json({
+      success: true,
+      credential: result
+    });
+  } catch (error) {
+    console.error('Error creating credential:', error);
+    res.status(500).json({ error: 'Failed to create credential' });
+  }
+});
+
+// Delete a credential
+router.delete('/credentials/:credentialId', async (req, res) => {
+  try {
+    const { credentialId } = req.params;
+    const success = credentialsDb.deleteCredential(req.user.id, parseInt(credentialId));
+
+    if (success) {
+      res.json({ success: true });
+    } else {
+      res.status(404).json({ error: 'Credential not found' });
+    }
+  } catch (error) {
+    console.error('Error deleting credential:', error);
+    res.status(500).json({ error: 'Failed to delete credential' });
+  }
+});
+
+// Toggle credential active status
+router.patch('/credentials/:credentialId/toggle', async (req, res) => {
+  try {
+    const { credentialId } = req.params;
+    const { isActive } = req.body;
+
+    if (typeof isActive !== 'boolean') {
+      return res.status(400).json({ error: 'isActive must be a boolean' });
+    }
+
+    const success = credentialsDb.toggleCredential(req.user.id, parseInt(credentialId), isActive);
+
+    if (success) {
+      res.json({ success: true });
+    } else {
+      res.status(404).json({ error: 'Credential not found' });
+    }
+  } catch (error) {
+    console.error('Error toggling credential:', error);
+    res.status(500).json({ error: 'Failed to toggle credential' });
+  }
+});
+
+export default router;