feat: refresh shared Git config mounts live

- Use profile-scoped canonical Git clone sources with locked refreshes
- Mount shared Git configuration read-only and isolate profile content
- Add API and desktop/mobile actions for live Git mount refresh

Quality gates: frontend build and backend py_compile passed.
Skipped: backend pytest/Ruff unavailable; Docker/manual checks not approved.

apps/web/src/components/features/config-profiles/ConfigProfileEditorPanel.tsx

@@ -23,6 +23,7 @@ interface Props {
   onSubmit: (e?: React.FormEvent) => void;
   onReset: () => void;
   onPreview: () => void;
+  onRefreshGitMounts: () => void;
   onAddInclude: (id: string) => void;
   onRemoveInclude: (index: number) => void;
   onDragStart: (e: React.DragEvent, index: number) => void;
@@ -63,6 +64,7 @@ export const ConfigProfileEditorPanel = ({
   onSubmit,
   onReset,
   onPreview,
+  onRefreshGitMounts,
   onAddInclude,
   onRemoveInclude,
   onDragStart,
@@ -114,6 +116,9 @@ export const ConfigProfileEditorPanel = ({
             </div>
             {!isCreating && selectedProfile && (
               <div className="row row-sm">
+                <button className="btn btn-secondary" onClick={onRefreshGitMounts}>
+                  <Icon name="refresh" size="sm" /> Refresh Git mounts
+                </button>
                 <button className="btn btn-secondary" onClick={onPreview} disabled={previewingId === selectedProfile.id}>
                   {previewingId === selectedProfile.id ? (
                     <><Icon name="loading" size="sm" /> Previewing...</>

apps/web/src/components/features/config-profiles/ConfigProfilesMobileView.tsx

@@ -64,6 +64,7 @@ interface Props {
 	) => void;
 	onRemoveMountFile: (mountIndex: number, path: string) => void;
 	onPreview: (id: string) => void;
+	onRefreshGitMounts: (id: string) => void;
 	onClosePreview: () => void;
 }
 
@@ -104,6 +105,7 @@ export const ConfigProfilesMobileView = ({
 	onUpdateMountFile,
 	onRemoveMountFile,
 	onPreview,
+	onRefreshGitMounts,
 	onClosePreview,
 }: Props) => {
 	const [isSaving, setIsSaving] = useState(false);
@@ -363,6 +365,13 @@ export const ConfigProfilesMobileView = ({
 				onDelete={handleDeleteClick}
 			>
 				<div className="mobile-detail-actions-extra">
+					<button
+						type="button"
+						className="secondary-button"
+						onClick={() => onRefreshGitMounts(selectedProfile.id)}
+					>
+						<Icon name="refresh" size="sm" /> Refresh Git mounts
+					</button>
 					<button
 						type="button"
 						className="secondary-button"