feat: local LLM multi-model, session search, cron proactive types, notifications, docs overhaul

Local LLM:
- user_settings.py: per-user hosts/models config (local_llm.json)
- routers/local_llm.py + static/local_llm.html: dedicated settings page
- llm_client.py: local OpenAI-compatible backend via httpx
- config.py: LOCAL_API_URL/KEY/MODEL + per-backend timeouts
- Active model shown near backend toggle (amber hint text)

Memory distillation:
- memory_distiller.py: DISTILL_BACKEND_MID/LONG .env overrides
- scheduler.py + notification.py: notify NC Talk after mid/long distill
- notification.py: outbound channel abstraction (NC Talk, extensible)

Session search:
- routers/files.py: GET /sessions/search?q= with excerpts grouped by date
- static/index.html + app.js: search UI in file sidebar with highlight
- _esc() helper to prevent XSS in search results

Proactive cron:
- cron_runner.py: new job types — message (send directly) and brief (LLM + send)
- Both support optional per-job channel override

Channels:
- routers/nextcloud_talk.py: consolidated using notification._send_nct_message()
- routers/auth.py: local backend status in /auth/status
- routers/chat.py: /backend returns {primary, fallback, local_model} object

UI / UX:
- Copy button for user messages (matching assistant)
- Autocomplete disabled on sensitive form fields
- settings.html: local model section replaced with link to /settings/local

Docs overhaul:
- MASTER.md hub + ARCH__SYSTEM/BACKENDS/PERSONA/CHANNELS/FUTURE.md
- ARCH__Intelligence_Layer.md replaced with redirect table
- CORTEX.md trimmed to vision only; README updated
- OPEN_WEBUI_API.md added to docs/

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

cortex/static/settings.html

@@ -241,7 +241,8 @@
           <label for="new_username">New username</label>
           <input type="text" id="new_username" name="new_username"
                  value="{{ username }}"
-                 pattern="[a-z_][a-z0-9_\-]{0,31}" required autofocus>
+                 pattern="[a-z_][a-z0-9_\-]{0,31}" required autofocus
+                 autocomplete="off" data-form-type="other">
           <p style="font-size:0.75rem; color:#94a3b8; margin-top:0.3rem;">
             Lowercase letters, digits, _ or - only. You will be logged out after renaming.
           </p>
@@ -281,8 +282,9 @@
         <div class="field">
           <label for="gemini_api_key">API Key</label>
           <input type="text" id="gemini_api_key" name="gemini_api_key"
-                 placeholder="{{ gemini_key_hint }}" autocomplete="off"
-                 spellcheck="false" data-1p-ignore data-lpignore="true">
+                 placeholder="{{ gemini_key_hint }}"
+                 autocomplete="new-password" spellcheck="false"
+                 data-1p-ignore data-lpignore="true" data-form-type="other">
         </div>
         <button type="submit">Save Key</button>
       </form>
@@ -294,6 +296,20 @@
       </p>
     </div>
 
+    <!-- Local models link -->
+    <div class="section">
+      <h2>Local Models</h2>
+      <p style="font-size:0.8rem; color:#94a3b8; margin-bottom:0.85rem; line-height:1.55;">
+        Configure OpenAI-compatible hosts and models (Open WebUI, Ollama, LM Studio, etc.).
+      </p>
+      <a href="/settings/local"
+         style="display:inline-block; padding:0.55rem 1rem; background:#7c3aed; border-radius:6px;
+                color:#fff; font-size:0.88rem; font-weight:600; text-decoration:none;
+                transition:background 0.15s;">
+        Manage local models →
+      </a>
+    </div>
+
     <!-- Change password -->
     <div class="section">
       <h2>Change Password</h2>