feat: add EN/ES/RO language selector for AI pitch generation

- db.py: add `language` column to ai_queue; migration; queue_ai() accepts
  language param and re-queues with ON CONFLICT UPDATE so changing language works
- main.py: batch and single assess endpoints accept `language` from request body
- enricher.py: ai_worker_loop reads language column, passes to _assess_one()
- replicate_ai.py: assess_domain() and _build_prompt() accept language param;
  OUTPUT LANGUAGE section injected into prompt so Gemini writes pitch/email in
  the requested language (EN/ES/RO)
- index.html: flag dropdown (🇪🇸/🇬🇧/🇷🇴) next to AI Assess button; aiLang
  state default ES; language sent in all batch assessment requests

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

app/static/index.html

@@ -343,6 +343,11 @@ tr:hover td{background:rgba(255,255,255,.025)}
       <button class="btn bs" @click="enqueueSelected()" :disabled="selected.length===0">
         + Enrich (<span x-text="selected.length"></span>)
       </button>
+      <select x-model="aiLang" style="padding:4px 8px;border-radius:6px;border:1px solid var(--border);background:var(--card);color:var(--text);font-size:13px;cursor:pointer" title="Pitch language">
+        <option value="ES">🇪🇸 ES</option>
+        <option value="EN">🇬🇧 EN</option>
+        <option value="RO">🇷🇴 RO</option>
+      </select>
       <button class="btn bai" @click="aiAssessSelected()" :disabled="selected.length===0">
         🤖 AI Assess (<span x-text="selected.length"></span>)
       </button>
@@ -550,7 +555,7 @@ function app() {
     tab: 'browse',
     stats: {}, indexSt: {ready:false,building:false,total:0},
     aiSt: {pending:0,running:0,done:0,failed:0,total:0},
-    domains: [], selected: [],
+    domains: [], selected: [], aiLang: 'ES',
     loading: false, page: 1, searchTotal: 0,
     f: {tld:'',keyword:'',min_score:0,cms:'',live_only:false,alpha_only:false,no_sld:false,kit_digital_only:false,limit:'100'},
     qst: {}, customDomains: '',
@@ -633,9 +638,9 @@ function app() {
 
     async aiAssessSelected() {
       if(!this.selected.length) return;
-      const r = await fetch('/api/ai/assess/batch',{method:'POST',headers:{'Content-Type':'application/json'},body:JSON.stringify({domains:this.selected})});
+      const r = await fetch('/api/ai/assess/batch',{method:'POST',headers:{'Content-Type':'application/json'},body:JSON.stringify({domains:this.selected,language:this.aiLang})});
       const d = await r.json();
-      r.ok ? this.notify(`Queued ${d.queued} for AI assessment`,'info') : this.notify('Error: '+d.error,'error');
+      r.ok ? this.notify(`Queued ${d.queued} for AI assessment [${this.aiLang}]`,'info') : this.notify('Error: '+d.error,'error');
       this.selected = [];
     },
 
@@ -644,9 +649,9 @@ function app() {
       const r = await fetch('/api/enriched?kit_digital=true&limit=500').then(r=>r.json());
       const domains = r.results.map(d=>d.domain);
       if(!domains.length) { this.notify('No Kit Digital domains enriched yet','info'); return; }
-      const r2 = await fetch('/api/ai/assess/batch',{method:'POST',headers:{'Content-Type':'application/json'},body:JSON.stringify({domains})});
+      const r2 = await fetch('/api/ai/assess/batch',{method:'POST',headers:{'Content-Type':'application/json'},body:JSON.stringify({domains,language:this.aiLang})});
       const d2 = await r2.json();
-      this.notify(`Queued ${d2.queued} Kit Digital domains for AI assessment`,'info');
+      this.notify(`Queued ${d2.queued} Kit Digital domains for AI assessment [${this.aiLang}]`,'info');
     },
 
     async enqueueCustom() {