Restructure chat service, web routes, and add test suite

Split monolithic chat service into modular structure with Matrix client
support, extract web server into per-resource route modules, introduce
bootstrap/main-loop separation, and add comprehensive vitest coverage
across services, repositories, and utilities. Adds project docs and
CLAUDE.md agent instructions.

src/web/routes/debug.ts

@@ -0,0 +1,42 @@
+import { Router } from 'express';
+import type { WebContext } from '../context.js';
+
+export function createDebugRouter(ctx: WebContext): Router {
+  const router = Router();
+
+  router.post('/debug/inspect-dom', async (req, res) => {
+    if (!ctx.services.chat) {
+      res.status(500).json({ error: 'Chat service not initialized' });
+      return;
+    }
+    try {
+      const chatUrl = req.body?.url;
+      if (!chatUrl) {
+        res.status(400).json({ error: 'url is required' });
+        return;
+      }
+      const result = await ctx.services.chat.debugInspectDom(chatUrl);
+      res.json(result);
+    } catch (error) {
+      ctx.logger.error('DOM inspection failed:', error);
+      res.status(500).json({ error: String(error) });
+    }
+  });
+
+  router.post('/debug/check-responses', async (_req, res) => {
+    if (!ctx.services.responseChecker) {
+      res.status(500).json({ error: 'Response checker not initialized' });
+      return;
+    }
+    try {
+      ctx.logger.info('Manual response check triggered via API');
+      const results = await ctx.services.responseChecker.checkForResponses();
+      res.json({ success: true, results });
+    } catch (error) {
+      ctx.logger.error('Manual response check failed:', error);
+      res.status(500).json({ error: String(error) });
+    }
+  });
+
+  return router;
+}