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.

tests/conftest.py

@@ -1,12 +1,41 @@
 """Shared pytest configuration.
 
-Ensures the repository root is on sys.path so tests can import the ``src``
-package regardless of the working directory pytest is invoked from.
+Puts the repository root on sys.path so tests can import the ``src`` package
+from any working directory, and provides ``pg_url``: a throwaway PostgreSQL
+schema for the database tests (stores, loaders). They need
+TEST_DATABASE_URL -- the variable the Rust tests use, e.g.
+postgres://postgres:ping@localhost:55432/ping -- and are skipped without it.
 """
 
 import os
 import sys
+import uuid
+
+import pytest
 
 REPO_ROOT = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
 if REPO_ROOT not in sys.path:
     sys.path.insert(0, REPO_ROOT)
+
+
+@pytest.fixture
+def pg_url():
+    """Connection string whose search_path is a fresh schema, dropped after."""
+    base = os.environ.get("TEST_DATABASE_URL", "").strip()
+    if not base:
+        pytest.skip("TEST_DATABASE_URL not set (PostgreSQL test)")
+    from sqlalchemy import create_engine, text
+
+    if base.startswith("postgres://"):
+        base = "postgresql://" + base[len("postgres://") :]
+    schema = f"pytest_{uuid.uuid4().hex[:12]}"
+    admin = create_engine(base)
+    with admin.begin() as conn:
+        conn.execute(text(f'CREATE SCHEMA "{schema}"'))
+    sep = "&" if "?" in base else "?"
+    try:
+        yield f"{base}{sep}options=-csearch_path%3D{schema}"
+    finally:
+        with admin.begin() as conn:
+            conn.execute(text(f'DROP SCHEMA "{schema}" CASCADE'))
+        admin.dispose()