simplify container: skip db prep, password via env var, fixed server IP

- start.sh: remove prepara_db.py step; load S3 creds via DuckDB init file
- Caddyfile: switch to basic_auth with {env.BASIC_AUTH_HASH} — no rebuild to rotate password
- Dockerfile: drop Python/pip layers (no longer needed at runtime)
- haloy.yml: set server to 89.167.95.136, add BASIC_AUTH_HASH to env
- remove requirements.txt (only needed for local prepara_db.py, not the container)

haloy.yml

@@ -1,10 +1,10 @@
 name: basedosdados
-server: YOUR_SERVER_IP_OR_HOSTNAME
+server: 89.167.95.136
 domains:
   - domain: db.xn--2dk.xyz
 port: 8080
 env:
-  - HETZNER_S3_BUCKET
   - HETZNER_S3_ENDPOINT
   - AWS_ACCESS_KEY_ID
   - AWS_SECRET_ACCESS_KEY
+  - BASIC_AUTH_HASH