feat(desktop): wire updater endpoint to self-hosted Gitea + document Tauri WS origin

Point the Tauri updater at the real self-hosted Gitea "latest release" path:
https://git.infra.msai.al/mca/parking_solution/releases/latest/download/latest.json
— redirects to the newest tag's latest.json published by release.yml. Verified
against tauri-plugin-updater: it GETs the endpoint (200 + manifest / 204 = up to
date) and reads platforms.linux-x86_64.{signature,url}.

Document the desktop WS origin: the Tauri window loads from tauri://localhost
(Linux may also send http://tauri.localhost), which is NOT same-origin with the
backend, so WS_ALLOWED_ORIGINS must include both or the live feed won't connect.
Added both to apps/server/.env.example.

Updated the as-built in wiki/decisions/desktop-shell-tauri.md. Also carries an
unrelated plans.namePlaceholder copy tweak already in the tree. turbo build lint
14/14 green.

Claude-Session: https://claude.ai/code/session_01Xcm6ikLgGoCxxHrxtjkk5V

apps/web/src/lib/i18n/sq.ts

@@ -496,7 +496,7 @@ export const sq = {
     newVersionHint: "Kjo publikon një version TË RI të planit — shitjet ekzistuese ruajnë çmimin origjinal.",
     period: "Periudha",
     pricePer: "Çmimi për periudhë",
-    namePlaceholder: "p.sh. Hotel ditor",
+    namePlaceholder: "p.sh. Mujor standard, ose Mujor natën, ose Hotel ditor",
     needName: "Emri i planit është i detyrueshëm.",
     needPrice: "Shkruaj një çmim më të madh se zero.",
     saved: "Plani u ruajt.",