docs: sync opx_infinity #96–#101 (+ #121, #122)

[dop42]

Syncs the site with opx_infinity PRs #96, #97, #99, #100, #101, #121 and #122 (the docs were synced through #95). Everything was read in the code on main.

Pages

• needs: new server contract page (GetNeeds, SetNeeds, AddNeeds); client contract is read only; opx:net:needs:push / pushed removed, values carries a reason; opx:on:needs:changed on both sides; /opx.needs.set; PUSH_MS / PUSH_DELTA removed.
• creators: new server exports GetNeeds, AddNeeds, SetNeeds; opx:on:needs:changed server event; give-consent note on opx:on:inventory:items; money.tooLarge, vehicle.registering, dead on OpenStash; client GetNeeds read only.
• inventory: give offers (giveOffer / giveAnswer / giveWithdrawn, give_* codes), HEALING config and Medical items, notes toast, weapon draw closes the bag, idle sweep for player-opened stashes, item STATUS added on the server.
• chat (STAFF_PERMISSION, chat.notLoaded, config bounds), shops (share codes only in that shop's room, uniform billed on Save, On Save line, downed), appearance (PriceWardrobe, PricedRoom, roomAlive, the bill option).
• calls (delete / forget, full list refused, offline rows, reach first, call toasts removed), garages (car names, Recalled, door on foot opens the list, bay promise, downed, echo), hauling, dealership (ledger idempotency, boot tag, message order, downed), crafting (refunds by citizen, token, downed), doorlock (busy, passcode bound), vehicles (removed net events, register lock), spawn (waiting, translatable places), character (name rules, name column, money.tooLarge, job/grade labels), elevators, gunsmith, vehiclekeys, clothing, admin, hud.
• core: OPX.Life.Down, OPX.Storage.EnsureColumn, OPX.Schema.AddColumns, error.incapacitated, OPX.Text.Clean UTF-8 mending.
• migration: release notes PRs #96–#101 with an upgrade table (removed net events, new/removed config, new codes, changed behaviour); from-opx77 rows for the needs and vehicle events updated.
• troubleshooting: hunger from a client script, chat on the character screen, share code outside a fitting room, give waiting for an answer, "Not while you are down", and a Reporting a problem section linking docs/IN_GAME_CHECKLIST.md and docs/PLATFORM_REQUESTS.md. contributing links CONTRIBUTING.md, docs/MANUAL.md and both new documents. Install's boot line reads 0.2.0 (opx_infinity #123).

Checks

• npm ci && npm run build: OK
• node scripts/check-content.mjs: 278 pages, 0 problems
• npm run types:check: OK
• npm run check:api against opx_infinity main (415f777): 1808 names, complete (was 27 failures)

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