feat: deploy ask TUI to ask.xn--2dk.xyz

- Add ttyd service for ask on port 7682
- Update haloy.yml with new domain and GEMINI_API_KEY
- Update Caddyfile to route ask.xn--2dk.xyz to ttyd
- Update Dockerfile to include ask binary
- Update README with ask section and schema files documentation

haloy.yml

@@ -5,9 +5,15 @@ api_token:
     env: HALOY_TOKEN
 domains:
   - domain: db.xn--2dk.xyz
-port: 8080
-health_check_path: /health
+    port: 8080
+    health_check_path: /health
+  - domain: ask.xn--2dk.xyz
+    port: 8080
+    health_check_path: /health
 env:
+  - name: GEMINI_API_KEY
+    from:
+      env: GEMINI_API_KEY
   - name: HETZNER_S3_ENDPOINT
     from:
       env: HETZNER_S3_ENDPOINT