feat(frontend): add config types and API client for file-config endpoints

- types/config.ts: TypeScript interfaces for ActionConfig, FilterConfig,
  JailFileConfig, ConfFileContent, and related request/response shapes
- api/config.ts: typed API functions for reading and writing conf files
- api/endpoints.ts: add /config/file/* endpoint constants

frontend/src/types/config.ts

@@ -242,3 +242,141 @@ export interface ConfFileCreateRequest {
   name: string;
   content: string;
 }
+
+// ---------------------------------------------------------------------------
+// Parsed filter config (Task 2.1 / 2.2)
+// ---------------------------------------------------------------------------
+
+/**
+ * Structured representation of a ``filter.d/*.conf`` file.
+ * Maps 1-to-1 with the backend ``FilterConfig`` Pydantic model.
+ */
+export interface FilterConfig {
+  /** Base name without extension, e.g. "sshd". */
+  name: string;
+  /** Actual filename, e.g. "sshd.conf". */
+  filename: string;
+  /** [INCLUDES] before directive, or null. */
+  before: string | null;
+  /** [INCLUDES] after directive, or null. */
+  after: string | null;
+  /** [DEFAULT] section key-value pairs (e.g. _daemon, __prefix). */
+  variables: Record<string, string>;
+  /** prefregex line, or null. */
+  prefregex: string | null;
+  /** failregex patterns (one per entry). */
+  failregex: string[];
+  /** ignoreregex patterns (one per entry). */
+  ignoreregex: string[];
+  /** maxlines, or null. */
+  maxlines: number | null;
+  /** datepattern, or null. */
+  datepattern: string | null;
+  /** journalmatch, or null. */
+  journalmatch: string | null;
+}
+
+/**
+ * Partial update payload for a filter config.
+ * All fields are optional; ``null`` means leave unchanged.
+ */
+export interface FilterConfigUpdate {
+  before?: string | null;
+  after?: string | null;
+  variables?: Record<string, string> | null;
+  prefregex?: string | null;
+  failregex?: string[] | null;
+  ignoreregex?: string[] | null;
+  maxlines?: number | null;
+  datepattern?: string | null;
+  journalmatch?: string | null;
+}
+
+// ---------------------------------------------------------------------------
+// Parsed action config (Task 3.1 / 3.2)
+// ---------------------------------------------------------------------------
+
+/**
+ * Structured representation of an ``action.d/*.conf`` file.
+ * Maps 1-to-1 with the backend ``ActionConfig`` Pydantic model.
+ */
+export interface ActionConfig {
+  /** Base name without extension, e.g. "iptables". */
+  name: string;
+  /** Actual filename, e.g. "iptables.conf". */
+  filename: string;
+  /** [INCLUDES] before directive, or null. */
+  before: string | null;
+  /** [INCLUDES] after directive, or null. */
+  after: string | null;
+  /** actionstart command, or null. */
+  actionstart: string | null;
+  /** actionstop command, or null. */
+  actionstop: string | null;
+  /** actioncheck command, or null. */
+  actioncheck: string | null;
+  /** actionban command, or null. */
+  actionban: string | null;
+  /** actionunban command, or null. */
+  actionunban: string | null;
+  /** actionflush command, or null. */
+  actionflush: string | null;
+  /** [Definition] key-value pairs that are not lifecycle commands. */
+  definition_vars: Record<string, string>;
+  /** [Init] section key-value pairs. */
+  init_vars: Record<string, string>;
+}
+
+/**
+ * Partial update payload for an action config.
+ * All fields are optional; ``null`` means leave unchanged.
+ */
+export interface ActionConfigUpdate {
+  before?: string | null;
+  after?: string | null;
+  actionstart?: string | null;
+  actionstop?: string | null;
+  actioncheck?: string | null;
+  actionban?: string | null;
+  actionunban?: string | null;
+  actionflush?: string | null;
+  definition_vars?: Record<string, string> | null;
+  init_vars?: Record<string, string> | null;
+}
+
+// ---------------------------------------------------------------------------
+// Parsed jail file config (Task 6.1 / 6.2)
+// ---------------------------------------------------------------------------
+
+/**
+ * Settings within a single [jailname] section of a jail.d/*.conf file.
+ * Maps 1-to-1 with the backend ``JailSectionConfig`` Pydantic model.
+ */
+export interface JailSectionConfig {
+  enabled: boolean | null;
+  port: string | null;
+  filter: string | null;
+  logpath: string[];
+  maxretry: number | null;
+  findtime: number | null;
+  bantime: number | null;
+  action: string[];
+  backend: string | null;
+  extra: Record<string, string>;
+}
+
+/**
+ * Structured representation of a ``jail.d/*.conf`` file.
+ * Maps 1-to-1 with the backend ``JailFileConfig`` Pydantic model.
+ */
+export interface JailFileConfig {
+  filename: string;
+  jails: Record<string, JailSectionConfig>;
+}
+
+/**
+ * Partial update payload for a jail file config.
+ */
+export interface JailFileConfigUpdate {
+  jails?: Record<string, JailSectionConfig> | null;
+}