feat: implement initial categories crud for human-in-the-loop norm builder

server.js

@@ -76,6 +76,65 @@ const server = http.createServer((req, res) => {
     return;
   }
 
+  // --- CATEGORIES CRUD ---
+  const CATEGORIES_FILE = path.join(CONFIG_DIR, 'categories.json');
+  const readCategories = () => {
+    if (fs.existsSync(CATEGORIES_FILE)) {
+      try { return JSON.parse(fs.readFileSync(CATEGORIES_FILE, 'utf-8')); } catch (e) {}
+    }
+    return [];
+  };
+
+  if (req.url.startsWith('/api/categories')) {
+    if (req.method === 'GET') {
+      res.writeHead(200, { 'Content-Type': 'application/json' });
+      res.end(JSON.stringify(readCategories()));
+      return;
+    }
+    
+    if (req.method === 'POST' || req.method === 'PUT') {
+      let body = '';
+      req.on('data', chunk => body += chunk.toString());
+      req.on('end', () => {
+        try {
+          const category = JSON.parse(body);
+          let categories = readCategories();
+          
+          if (req.method === 'POST') {
+            category.id = Date.now().toString();
+            categories.push(category);
+          } else {
+            const index = categories.findIndex(c => c.id === category.id);
+            if (index !== -1) categories[index] = { ...categories[index], ...category };
+          }
+          
+          fs.writeFileSync(CATEGORIES_FILE, JSON.stringify(categories, null, 2));
+          res.writeHead(200, { 'Content-Type': 'application/json' });
+          res.end(JSON.stringify(category));
+        } catch (err) {
+          res.writeHead(400); res.end(JSON.stringify({ error: 'Invalid payload' }));
+        }
+      });
+      return;
+    }
+
+    if (req.method === 'DELETE') {
+      const urlParams = new URL(req.url, `http://${req.headers.host}`);
+      const id = urlParams.searchParams.get('id');
+      if (id) {
+        let categories = readCategories();
+        categories = categories.filter(c => c.id !== id);
+        fs.writeFileSync(CATEGORIES_FILE, JSON.stringify(categories, null, 2));
+        res.writeHead(200, { 'Content-Type': 'application/json' });
+        res.end(JSON.stringify({ success: true }));
+      } else {
+        res.writeHead(400); res.end(JSON.stringify({ error: 'Missing id' }));
+      }
+      return;
+    }
+  }
+  // --- END CATEGORIES CRUD ---
+
   // Serve static files
   let filePath = path.join(DIST_DIR, req.url === '/' ? 'index.html' : req.url);