Add server/dist build to repository for zero-dependency prod deploy

Integrate Vue webclient into server: serve SPA from /, remove proxy.php, update auth redirects

Fix framework bugs found during OTA testing ...

- DevTools: guard against empty sql_queries array before accessing last index
- RouterImplementation: skip empty route var names in POST routing
- CallControl: skip empty route var names when building action params
- Update .gitignore to exclude Cache, Logs, and firmwares dirs

Phase 1: Security Foundation (auth, SQLi, secrets, hashing, tokens, cookies)

Added .gitignore