Fix P0 review issues: dedup exception logs, SqlQueryLogger stack, chmod once, json_encode guard, RequestLogger guard

P0: super-verbose server logging — JSONL, levels, request/SQL/error/device HTTP logs

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 5: Code quality and tech debt (side effects, dedup, dead code, config extraction, log security)

init framework