Config page tasks 1-4: dropdowns, key props, inactive jail full GUI, banaction fix

Task 1: Backend/LogEncoding/DatePattern dropdowns in JailConfigDetail
- Added BACKENDS, LOG_ENCODINGS, DATE_PATTERN_PRESETS constants
- Backend and Log Encoding: <Input readOnly> → <Select> (editable, auto-saves)
- Date Pattern: <Input> → <Combobox freeform> with presets
- Extended JailConfigUpdate model (backend, log_encoding) and service
- Added readOnly prop to JailConfigDetail (all fields, toggles, buttons)
- Extended RegexList with readOnly prop

Task 2: Fix raw action/filter config always blank
- Added key={selectedAction.name} to ActionDetail in ActionsTab
- Added key={selectedFilter.name} to FilterDetail in FiltersTab

Task 3: Inactive jail full GUI same as active jails
- Extended InactiveJail Pydantic model with all config fields
- Added _parse_time_to_seconds helper to config_file_service
- Updated _build_inactive_jail to populate all extended fields
- Extended InactiveJail TypeScript type to match
- Rewrote InactiveJailDetail to reuse JailConfigDetail (readOnly=true)

Task 4: Fix banaction interpolation error when activating jails
- _write_local_override_sync now includes banaction=iptables-multiport
  and banaction_allports=iptables-allports in every .local file

frontend/src/types/config.ts

@@ -77,6 +77,8 @@ export interface JailConfigUpdate {
   prefregex?: string | null;
   date_pattern?: string | null;
   dns_mode?: string | null;
+  backend?: string | null;
+  log_encoding?: string | null;
   enabled?: boolean | null;
   bantime_escalation?: BantimeEscalationUpdate | null;
 }
@@ -498,6 +500,26 @@ export interface InactiveJail {
   findtime: string | null;
   /** Number of failures before a ban is issued, or null. */
   maxretry: number | null;
+  /** Ban duration in seconds, parsed from bantime. */
+  ban_time_seconds: number;
+  /** Failure-counting window in seconds, parsed from findtime. */
+  find_time_seconds: number;
+  /** Log encoding, e.g. ``"auto"`` or ``"utf-8"``. */
+  log_encoding: string;
+  /** Log-monitoring backend. */
+  backend: string;
+  /** Date pattern for log parsing, or null for auto-detect. */
+  date_pattern: string | null;
+  /** DNS resolution mode. */
+  use_dns: string;
+  /** Prefix regex prepended to every failregex. */
+  prefregex: string;
+  /** List of failure regex patterns. */
+  fail_regex: string[];
+  /** List of ignore regex patterns. */
+  ignore_regex: string[];
+  /** Ban-time escalation configuration, or null. */
+  bantime_escalation: BantimeEscalation | null;
   /** Absolute path to the config file where this jail is defined. */
   source_file: string;
   /** Effective ``enabled`` value — always ``false`` for inactive jails. */