Merge remote-tracking branch 'origin/master' into gitea/feature/end

Resolved conflicts taking origin/master (v0.5.55) as canonical, with local
features re-applied:
- runtime log level (LOG_LEVEL env + dashboard Settings → Logging, applied
  immediately and persisted across restarts)
- free/noAuth provider enable/disable toggle via providerStrategies.enabled
- parallel model testing (Test All Models / Test Selected Keys)

open-sse/rtk/constants.js

@@ -4,6 +4,7 @@ export const MIN_COMPRESS_SIZE = 500;          // bytes; skip tiny blobs
 export const DETECT_WINDOW = 1024;             // autodetect peeks first N chars
 export const GIT_DIFF_HUNK_MAX_LINES = 100;    // per-hunk line cap
 export const GIT_DIFF_CONTEXT_KEEP = 3;        // context lines around changes
+export const GIT_LOG_MAX_LINES = 200;          // gitLog line cap
 export const DEDUP_LINE_MAX = 2000;            // dedupLog truncation cap
 
 // Rust pipe_cmd.rs parity caps