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/api/endpoints.ts

@@ -84,10 +84,13 @@ export const ENDPOINTS = {
   configJailFileParsed: (filename: string): string =>
     `/config/jail-files/${encodeURIComponent(filename)}/parsed`,
   configFilters: "/config/filters",
+  configFiltersRaw: "/config/filters/raw",
   configFilter: (name: string): string => `/config/filters/${encodeURIComponent(name)}`,
   configFilterRaw: (name: string): string => `/config/filters/${encodeURIComponent(name)}/raw`,
   configFilterParsed: (name: string): string =>
     `/config/filters/${encodeURIComponent(name)}/parsed`,
+  configJailFilter: (name: string): string =>
+    `/config/jails/${encodeURIComponent(name)}/filter`,
   configActions: "/config/actions",
   configAction: (name: string): string => `/config/actions/${encodeURIComponent(name)}`,
   configActionParsed: (name: string): string =>