chore: remove the Python service; Python is the training stack only

Phase 4 of docs/RUST_REWRITE.md. Since 2026-10-18 ping-collector (rust/)
collects, forecasts, notifies (ntfy + Matrix) and serves the website/API;
nothing in production ran the Python service code any more.

Removed (~17k lines): the FastAPI app (web_api, schemas, health_check,
metrics, postgres_history, forecast_history, thaiwater), the Python RID
collector and CLI (water_scraper_v3, main, run.py), the notifier and Matrix
alerting (notify, alerting), the multi-backend adapters (SQLite, MySQL,
InfluxDB, VictoriaMetrics) with demo databases, models/validators/exceptions/
logging/rate limiter, ml/skill.py (served by Rust now), the migration tooling
(api_parity, collector_parity, e2e_notify, install_collector.sh,
gen_notify_cases.py, spikes/rust-forecast), Docker/compose/Grafana files,
sql/, the release workflow and the docs for all of that. Their tests went
with them.

Kept in Python: src/ml (training, evaluation harness, export; predict.py as
the reference the Rust forecaster is tested against), the HII and RID-dam
clients/stores for the archive backfills (their live collectors removed),
the backfill scripts, retrain.sh + timer, forecast_parity.py.

- PostgreSQL only: src/config.py is database_url() from POSTGRES_* / .env;
  the stores lost their sqlite/mysql branches (and the 2026-08 column
  migration). The database tests run against a throwaway schema from
  TEST_DATABASE_URL (tests/conftest.py pg_url, skipped without it), as the
  Rust tests do; CI gets a PostgreSQL service. 100 tests (66 without a DB).
- The notifier settings moved from src/notify.py into src/ml/export.py;
  flood_config.json regenerates byte-identical.
- tests/test_dashboard.py checks every path the dashboard fetches against
  ping-collector's router.
- Dependencies: fastapi, uvicorn, pydantic, influxdb, pymysql, psutil,
  schedule, sphinx, pyinstaller, mypy, pytest-asyncio dropped; python-dotenv
  1.1.1 explicit (it came in through uvicorn[standard]).
- Formatting contract extended to scripts/ and tests/ (reformatted once).
- scripts/install.sh is the one installer (fresh host or update, in place in
  a checkout without touching its ownership): binary, units, uv sync, .env
  defaults, removes the retired water-monitor.service and any old
  --alert-check cron job, dry run + forecast check, restart, readiness wait.
- Docs, CLAUDE.md, CONTRIBUTING.md, .env.example, Makefile, unit comments
  and Rust doc comments updated to the Rust service.

rust/collector/src/db.rs

@@ -30,8 +30,9 @@ pub async fn connect(url: &str, max_connections: u32) -> Result<PgPool> {
         .context("connecting to PostgreSQL")
 }
 
-/// Idempotent DDL, identical to what the Python app creates (so either side
-/// can start first against an empty database).
+/// Idempotent DDL, identical to what the Python app created and the Python
+/// backfill stores (src/hii_collector.py, src/rid_reservoir.py) still create,
+/// so either can start first against an empty database.
 const SCHEMA: &[&str] = &[
     "CREATE TABLE IF NOT EXISTS stations (
         id SERIAL PRIMARY KEY,
@@ -145,12 +146,12 @@ const SCHEMA: &[&str] = &[
         created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
         PRIMARY KEY (as_of, station_code, horizon_hours))",
     "CREATE INDEX IF NOT EXISTS idx_forecast_history_station ON forecast_history(station_code, as_of)",
-    // src/notify.py
+    // notify.rs
     "CREATE TABLE IF NOT EXISTS notification_state (
         key VARCHAR(64) PRIMARY KEY, state VARCHAR(16) NOT NULL,
         value NUMERIC(8,3), updated_at TIMESTAMP NOT NULL)",
-    // The current /forecast payload, read by the Python API when
-    // FORECAST_IN_COLLECTOR=true (one row, id 'all').
+    // The current /forecast payload (one row, id 'all'), served by
+    // `ping-collector serve` when the website runs as its own process.
     "CREATE TABLE IF NOT EXISTS forecast_current (
         id VARCHAR(16) PRIMARY KEY,
         computed_at TIMESTAMP NOT NULL,
@@ -727,7 +728,7 @@ pub async fn save_forecast_history(
     Ok(rows.len())
 }
 
-/// The payload the Python API serves as /forecast.
+/// The payload /forecast serves (see `forecast_current` above).
 pub async fn save_forecast_current(
     pool: &PgPool,
     computed_at: NaiveDateTime,