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)

requirements.txt

@@ -1,3 +0,0 @@
-duckdb
-boto3
-python-dotenv