refactor: reorganize project structure and fix broken references

- Move scripts to scripts/ directory (roda.sh, prepara_db.py, etc.)
- Move shell config to shell/ directory (Caddyfile, auth.py, haloy.yml)
- Move basedosdados.duckdb to data/ directory
- Update Dockerfile and start.sh with new file paths
- Update README.md with correct script paths
- Remove Python ask.py (replaced by Rust binary in ask/ask)
- Add Rust source files (schema_filter.rs, sql_generator.rs, table_selector.rs)
- Remove sentence-transformer dependencies from ask
- Move docs and context artifacts to their directories

start.sh

@@ -19,13 +19,13 @@ SQL
 chmod 600 /app/ssh_init.sql
 
 echo "[start] Starting ttyd terminal (db)..."
-ttyd --port 7681 --writable duckdb -readonly --init /app/ssh_init.sql /app/basedosdados.duckdb &
+ttyd --port 7681 --writable duckdb -readonly --init /app/ssh_init.sql /app/data/basedosdados.duckdb &
 
 echo "[start] Starting ttyd terminal (ask)..."
-ttyd --port 7682 --writable python3 /app/ask.py &
+ttyd --port 7682 --writable /app/ask &
 
 echo "[start] Starting auth service..."
-python3 /app/auth.py &
+python3 /app/shell/auth.py &
 
 echo "[start] Starting Caddy..."
 exec caddy run --config /app/Caddyfile --adapter caddyfile