nodes: what porting the house needed from the vocabulary

Four small things, each with a device behind it.

An MQTT filter now routes what it subscribed to. `+` and `#` reached the
broker and were then looked up in an exact-match dict, so every message a
wildcard subscription received was dropped in silence.

`json_key` lifts a value out of the object a device wraps it in — Victron
publishes `{"value": 47}` on every path, which was otherwise a Python node
per port.

The trigger node learned `passthrough` and `wait_port`, because how long to
wait can be a value rather than a constant: a rollershutter takes 26 seconds
up and 28 down. A wait of zero sends nothing afterwards and still cancels
what the last message scheduled, which is how a stop is commanded once
instead of forever.

The HTTP sender takes fixed `query` parameters, so an API key is a secret
reference rather than a message on the canvas, and `send_inputs` off for a
request whose inputs are only a trigger.

Also: `delay` accepts fractional seconds, and `TZ` reaches the container, so
a cron expression means local time. Left unset it is UTC, as before.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

docs/reference/configuration.md

@@ -88,6 +88,13 @@ remember it is fixed at build time: changing it means rebuilding that image.
 |---|---|---|
 | `ENVIRONMENT` | `local` | `local`, `staging` or `production` |
 | `PRIVATE_API_ENABLED` | `false` | unauthenticated test-only endpoints; needs `ENVIRONMENT=local` too |
+| `TZ` | `UTC` | the timezone every schedule is written in |
+
+`TZ` is the container's own, not a setting the code reads: an `inject` or a
+`delay` with a cron expression fires on local time. Left at `UTC`, "off at
+02:00" means two in the morning UTC, which in most of the world is neither two
+o'clock nor the same hour in summer as in winter. Set it to where the
+installation is.
 
 `production` closes `/docs`, `/redoc` and the OpenAPI document, because the
 schema enumerates every endpoint the installation serves — including the paths