Redesign FiltersTab with active/inactive layout and assign/create dialogs (Tasks 2.3/2.4)

- Rewrite FiltersTab: use fetchFilters() for FilterConfig[] with embedded active
  status; show 'Active — sshd, apache-auth' badge labels; FilterDetail sub-
  component with source_file/override badges, FilterForm, Assign button, raw
  config section
- New AssignFilterDialog: selects jail from enabled-jails list, calls
  POST /config/jails/{name}/filter with optional fail2ban reload
- New CreateFilterDialog: name+failregex+ignoreregex form, calls
  POST /config/filters, closes and selects new filter on success
- Extend ConfigListDetail: add listHeader (for Create button) and
  itemBadgeLabel (for custom badge text) optional props
- Fix updateFilterFile bug: was PUT /config/filters/{name} (structured
  endpoint), now correctly PUT /config/filters/{name}/raw
- Fix createFilterFile bug: was POST /config/filters, now POST /config/filters/raw
- Add updateFilter, createFilter, deleteFilter, assignFilterToJail to api/config.ts
- Add FilterUpdateRequest, FilterCreateRequest, AssignFilterRequest to types/config.ts
- Add configFiltersRaw, configJailFilter endpoints
- Tests: 24 new tests across FiltersTab, AssignFilterDialog, CreateFilterDialog
  (all 89 frontend tests passing)

frontend/src/types/config.ts

@@ -460,3 +460,45 @@ export interface JailActivationResponse {
   /** Human-readable result message. */
   message: string;
 }
+
+// ---------------------------------------------------------------------------
+// Filter write requests (Task 2.3)
+// ---------------------------------------------------------------------------
+
+/**
+ * Payload for ``PUT /api/config/filters/{name}``.
+ *
+ * Only the user-editable ``[Definition]`` fields are accepted.
+ * Fields set to ``null`` or omitted leave the existing value unchanged.
+ */
+export interface FilterUpdateRequest {
+  failregex?: string[] | null;
+  ignoreregex?: string[] | null;
+  datepattern?: string | null;
+  journalmatch?: string | null;
+}
+
+/**
+ * Payload for ``POST /api/config/filters``.
+ *
+ * Creates a new user-defined filter at ``filter.d/{name}.local``.
+ */
+export interface FilterCreateRequest {
+  /** Base name without extension (e.g. ``my-custom-filter``). */
+  name: string;
+  failregex?: string[];
+  ignoreregex?: string[];
+  prefregex?: string | null;
+  datepattern?: string | null;
+  journalmatch?: string | null;
+}
+
+/**
+ * Payload for ``POST /api/config/jails/{jail_name}/filter``.
+ *
+ * Assigns a filter to a jail by writing ``filter = {filter_name}`` to the
+ * jail's ``.local`` config file.
+ */
+export interface AssignFilterRequest {
+  filter_name: string;
+}