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

backend/app/services/config_service.py

@@ -366,6 +366,10 @@ async def update_jail_config(
         await _set("datepattern", update.date_pattern)
     if update.dns_mode is not None:
         await _set("usedns", update.dns_mode)
+    if update.backend is not None:
+        await _set("backend", update.backend)
+    if update.log_encoding is not None:
+        await _set("logencoding", update.log_encoding)
     if update.prefregex is not None:
         await _set("prefregex", update.prefregex)
     if update.enabled is not None: