fix: inline git test feedback and use form URLs (0.20.1)

Show git check result next to the button, scroll into view, and test unsaved repo URLs from the form.

tools/probe_git_release.py

@@ -0,0 +1,21 @@
+#!/usr/bin/env python3
+import sys
+sys.path.insert(0, "/opt/security-alert-center/backend")
+
+from app.database import SessionLocal
+from app.services.agent_update_settings import get_effective_agent_update_config
+from app.services.agent_git_release import get_git_release_versions
+
+db = SessionLocal()
+try:
+    cfg = get_effective_agent_update_config(db)
+    print("cfg rdp:", cfg.rdp_git_repo_url)
+    print("cfg ssh:", cfg.ssh_git_repo_url)
+    print("cfg branch:", cfg.git_branch)
+    r = get_git_release_versions(cfg, db=db, force_refresh=True)
+    print("versions:", r.versions)
+    print("errors:", r.errors)
+    print("from_cache:", r.from_cache)
+    print("fetched_at:", r.fetched_at)
+finally:
+    db.close()