replace duckdb-ui with ttyd shell: add /query HTTP endpoint, fix utf-8/locale, region config

- swap DuckDB UI for ttyd web terminal (--writable, -readonly db)
- add POST /query endpoint with X-Password auth for curl-based SQL execution
- fix UTF-8 rendering: set LANG/LC_ALL=C.UTF-8 in container
- pass BUCKET_REGION env var for correct S3 signing region
- simplify start.sh: drop Xvfb, views.duckdb generation, blocking duckdb -ui
- add less, ncurses-bin to Dockerfile for proper pager/terminal support
- update Caddyfile: single route to ttyd with flush_interval -1 for websocket
- update README to reflect current architecture and document /query usage
- remove duckdb-ui.service, schemas.json, file_tree.md (generated artifacts)

haloy.yml

@@ -1,8 +1,12 @@
 name: basedosdados
-server: haloy.datative.xn--2dk.digital
+server: haloy.xn--2dk.xyz
+api_token:
+  from:
+    env: HALOY_TOKEN
 domains:
   - domain: db.xn--2dk.xyz
 port: 8080
+health_check_path: /health
 env:
   - name: HETZNER_S3_ENDPOINT
     from:
@@ -13,6 +17,9 @@ env:
   - name: AWS_SECRET_ACCESS_KEY
     from:
       env: AWS_SECRET_ACCESS_KEY
-  - name: BASIC_AUTH_HASH
+  - name: BASIC_AUTH_PASSWORD
     from:
-      env: BASIC_AUTH_HASH
+      env: BASIC_AUTH_PASSWORD
+  - name: BUCKET_REGION
+    from:
+      env: BUCKET_REGION