fix: add timeouts to SSL/DNS blocking calls, reset stuck AI jobs on startup

- SSL handshake: set socket timeout before wrap_socket (prevents indefinite hang)
- SSL executor: asyncio.wait_for(..., timeout=12)
- DNS gethostbyname: asyncio.wait_for(..., timeout=6)
- analyze_site: hard 90s timeout wrapper
- _assess_one: hard 180s ceiling via asyncio.timeout()
- ai_worker_loop: reset 'running' → 'pending' on startup (clears crashed-session jobs)
- Add POST /api/ai/reset endpoint + UI button to unstick jobs without restart

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/static/index.html

@@ -444,6 +444,7 @@ tr:hover td{background:rgba(255,255,255,.025)}
       <div style="display:flex;gap:6px;flex-wrap:wrap">
         <button class="btn bai" @click="aiAssessAllKD()">🤖 AI Assess all Kit Digital domains</button>
         <button class="btn bg sm" @click="restartAiWorker()">↺ Restart AI worker</button>
+        <button class="btn bw sm" @click="resetAiStuck()">⚡ Reset stuck jobs</button>
         <a class="btn bg sm" href="/api/ai/debug" target="_blank" style="text-decoration:none">🔍 Debug AI queue</a>
       </div>
     </div>
@@ -630,7 +631,8 @@ function app() {
       try { this.qst = await fetch('/api/enrich/status').then(r=>r.json()); } catch(e){}
     },
 
-    async restartAiWorker() { const r=await fetch('/api/ai/worker/restart',{method:'POST'}); this.notify('AI worker restarted','info'); await this.loadAiStatus(); },
+    async restartAiWorker() { await fetch('/api/ai/worker/restart',{method:'POST'}); this.notify('AI worker restarted','info'); await this.loadAiStatus(); },
+    async resetAiStuck() { const r=await fetch('/api/ai/reset',{method:'POST'}); const d=await r.json(); this.notify(`Reset ${d.reset} stuck jobs → pending`,'success'); await this.loadAiStatus(); },
     async startEnrich()  { await fetch('/api/enrich/resume',{method:'POST'}); this.notify('Worker started','success'); await this.loadQueue(); },
     async pauseEnrich()  { await fetch('/api/enrich/pause',{method:'POST'}); this.notify('Worker paused','success'); await this.loadQueue(); },
     async retryFailed()  { await fetch('/api/enrich/retry',{method:'POST'}); this.notify('Retrying failed','success'); await this.loadQueue(); },