Add Deactivate Jail button for inactive jails with local override

- Add has_local_override field to InactiveJail model
- Update _build_inactive_jail and list_inactive_jails to compute the field
- Add delete_jail_local_override() service function
- Add DELETE /api/config/jails/{name}/local router endpoint
- Surface has_local_override in frontend InactiveJail type
- Show Deactivate Jail button in JailsTab when has_local_override is true
- Add tests: TestBuildInactiveJail, TestListInactiveJails, TestDeleteJailLocalOverride

frontend/src/components/config/__tests__/ActivateJailDialog.test.tsx

@@ -6,7 +6,6 @@
  *  - "Activate" button is enabled when validation passes.
  *  - Dialog stays open and shows an error when the backend returns active=false.
  *  - `onActivated` is called and dialog closes when backend returns active=true.
- *  - `onCrashDetected` is called when fail2ban_running is false after activation.
  */
 
 import { describe, it, expect, vi, beforeEach } from "vitest";
@@ -55,6 +54,7 @@ const baseJail: InactiveJail = {
   bantime_escalation: null,
   source_file: "/config/fail2ban/jail.d/airsonic-auth.conf",
   enabled: false,
+  has_local_override: false,
 };
 
 /** Successful activation response. */
@@ -98,7 +98,6 @@ interface DialogProps {
   open?: boolean;
   onClose?: () => void;
   onActivated?: () => void;
-  onCrashDetected?: () => void;
 }
 
 function renderDialog({
@@ -106,7 +105,6 @@ function renderDialog({
   open = true,
   onClose = vi.fn(),
   onActivated = vi.fn(),
-  onCrashDetected = vi.fn(),
 }: DialogProps = {}) {
   return render(
     <FluentProvider theme={webLightTheme}>
@@ -115,7 +113,6 @@ function renderDialog({
         open={open}
         onClose={onClose}
         onActivated={onActivated}
-        onCrashDetected={onCrashDetected}
       />
     </FluentProvider>,
   );
@@ -202,28 +199,4 @@ describe("ActivateJailDialog", () => {
       expect(onActivated).toHaveBeenCalledOnce();
     });
   });
-
-  it("calls onCrashDetected when fail2ban_running is false after activation", async () => {
-    mockValidateJailConfig.mockResolvedValue(validationPassed);
-    mockActivateJail.mockResolvedValue({
-      ...successResponse,
-      fail2ban_running: false,
-    });
-
-    const onActivated = vi.fn();
-    const onCrashDetected = vi.fn();
-    renderDialog({ onActivated, onCrashDetected });
-
-    await waitFor(() => {
-      expect(screen.queryByText(/validating configuration/i)).not.toBeInTheDocument();
-    });
-
-    const activateBtn = screen.getByRole("button", { name: /^activate$/i });
-    await userEvent.click(activateBtn);
-
-    await waitFor(() => {
-      expect(onCrashDetected).toHaveBeenCalledOnce();
-    });
-    expect(onActivated).toHaveBeenCalledOnce();
-  });
 });