fix: the follow-ups the v4.2.1 audit turned up

Five findings from auditing the release branch, none of them a blocker for it,
all of them things it would have shipped with.

The mirrored booking price only survived an edit when the form happened to fill
metadata of its own. Both reservation forms and the phone sheet sent
`metadata: null` whenever the form had no metadata key to send, and null clears
the column outright — so restaurant, event, tour, parking, other, a hotel with
no check-in times and a transport with no carrier details all lost the price
again on the next save. They send the object now: it still clears what the form
dropped, and the server carries the price across (#2233).

Your share counted expenses nobody has paid for, while the balances right below
it stopped counting them. The tile contradicted the panel it sits in (#2225).

App.tsx kept its own list of routes that must not mount authed-only widgets, and
it had already drifted from the one the response interceptor uses: this one
named /public/journey/, that one covers all of /public/. It reads
isAuthPublicPath now, so a route cannot be public to one and not the other.

LLM_TIMEOUT_MS and TREK_PLUGINS_IGNORE_TREK_RANGE shipped in .env.example but
not in the compose file most installs actually read.

And a typo in the Russian offline copy: Завершёна → Завершена.

docker-compose.yml

@@ -49,6 +49,8 @@ services:
 #      - MCP_RATE_LIMIT=300 # Max MCP API requests per user per minute (default: 300)
 #      - MCP_MAX_SESSION_PER_USER=20 # Max concurrent MCP sessions per user (default: 20)
 #      - KITINERARY_EXTRACTOR_PATH= # Optional. Full path to kitinerary-extractor binary. Auto-detected from PATH and /usr/lib/*/libexec/kf6/ when unset.
+#      - LLM_TIMEOUT_MS=900000 # Optional. Ceiling (ms) for one AI-parsing call before it is abandoned, applied to every provider and to the HTTP client underneath. Generous by default so heavier documents fit; lower it on a cloud provider to fail fast. Must be a whole number of milliseconds between 1 and 2147483647 — anything else stops the server at startup with the reason. (default: 900000)
+#      - TREK_PLUGINS_IGNORE_TREK_RANGE=true # Optional. Lets plugins whose declared TREK version range predates this build, and plugins that declare none, be installed and activated anyway. Every gate warns instead of refusing; the plugin-API version gate and the Discover compatibility verdict stay hard. Off unless set. (default: off)
 #      - UNSPLASH_ACCESS_KEY= # Optional. Unsplash Access Key for trip-cover / place-image search. Without one, TREK uses Unsplash's unauthenticated endpoint, which some datacenter/VPS IPs are blocked from (#1449). Free key at unsplash.com/developers. Can also be set per-admin in Admin > Settings; the env var overrides that.
     volumes:
       - ./data:/app/data