feat(channel-monitor): request templates with snapshot apply + headers/body override

Problem:
Upstream channels can reject monitor probes based on client fingerprint
(e.g. "only Claude Code clients allowed"). The monitor had no way to
customize the outgoing request to bypass such restrictions.

Solution:
Introduce reusable request templates that carry extra_headers plus an
optional body override; monitors reference a template and receive a
snapshot copy on apply. Template edits do NOT auto-propagate — users
must click "apply to associated monitors" to refresh snapshots, so a
bad template edit cannot instantly break all production monitors.

Data model (migration 112):
- channel_monitor_request_templates: id, name, provider, description,
  extra_headers jsonb, body_override_mode ('off'|'merge'|'replace'),
  body_override jsonb. Unique (provider, name).
- channel_monitors: +template_id (FK, ON DELETE SET NULL), +extra_headers,
  +body_override_mode, +body_override (the three runtime snapshot fields).

Checker (channel_monitor_checker.go):
- callProvider + runCheckForModel accept a CheckOptions carrying the
  snapshot fields. mergeHeaders applies user headers on top of adapter
  defaults (forbidden list: Host / Content-Length / Transfer-Encoding /
  Connection / Content-Encoding).
- buildRequestBody:
    off     -> adapter default body
    merge   -> shallow-merge over default; per-provider deny list
               (model/messages/contents) protects the challenge contract
    replace -> user body verbatim
- Replace mode skips challenge validation; instead HTTP 2xx + non-empty
  extracted response text = operational, empty = failed.
- 4 new unit tests cover all three modes + replace/empty-response case.

Admin API:
- /admin/channel-monitor-templates CRUD + /:id/apply (overwrite snapshot
  on all template_id=id monitors, returns affected count).
- channel_monitor request/response DTOs gain the 4 new fields.

Frontend:
- channelMonitorTemplate.ts API client.
- MonitorAdvancedRequestConfig.vue shared component for headers textarea
  + body mode radio + body JSON editor; used by both template and monitor
  forms.
- MonitorTemplateManagerDialog.vue: provider tabs, list/create/edit/
  delete/apply, live "associated monitors" count per row.
- MonitorFiltersBar: new 模板管理 button next to 新增监控.
- MonitorFormDialog: collapsible 高级 section with template dropdown
  (filtered by form.provider, clears on provider change) + embedded
  AdvancedRequestConfig. Picking a template copies its fields into the
  form (snapshot semantics mirrored on the client).
- i18n zh/en entries for all new copy.

chore: bump version to 0.1.114.32

backend/ent/channelmonitorrequesttemplate/channelmonitorrequesttemplate.go

@@ -0,0 +1,172 @@
+// Code generated by ent, DO NOT EDIT.
+
+package channelmonitorrequesttemplate
+
+import (
+	"fmt"
+	"time"
+
+	"entgo.io/ent/dialect/sql"
+	"entgo.io/ent/dialect/sql/sqlgraph"
+)
+
+const (
+	// Label holds the string label denoting the channelmonitorrequesttemplate type in the database.
+	Label = "channel_monitor_request_template"
+	// FieldID holds the string denoting the id field in the database.
+	FieldID = "id"
+	// FieldCreatedAt holds the string denoting the created_at field in the database.
+	FieldCreatedAt = "created_at"
+	// FieldUpdatedAt holds the string denoting the updated_at field in the database.
+	FieldUpdatedAt = "updated_at"
+	// FieldName holds the string denoting the name field in the database.
+	FieldName = "name"
+	// FieldProvider holds the string denoting the provider field in the database.
+	FieldProvider = "provider"
+	// FieldDescription holds the string denoting the description field in the database.
+	FieldDescription = "description"
+	// FieldExtraHeaders holds the string denoting the extra_headers field in the database.
+	FieldExtraHeaders = "extra_headers"
+	// FieldBodyOverrideMode holds the string denoting the body_override_mode field in the database.
+	FieldBodyOverrideMode = "body_override_mode"
+	// FieldBodyOverride holds the string denoting the body_override field in the database.
+	FieldBodyOverride = "body_override"
+	// EdgeMonitors holds the string denoting the monitors edge name in mutations.
+	EdgeMonitors = "monitors"
+	// Table holds the table name of the channelmonitorrequesttemplate in the database.
+	Table = "channel_monitor_request_templates"
+	// MonitorsTable is the table that holds the monitors relation/edge.
+	MonitorsTable = "channel_monitors"
+	// MonitorsInverseTable is the table name for the ChannelMonitor entity.
+	// It exists in this package in order to avoid circular dependency with the "channelmonitor" package.
+	MonitorsInverseTable = "channel_monitors"
+	// MonitorsColumn is the table column denoting the monitors relation/edge.
+	MonitorsColumn = "template_id"
+)
+
+// Columns holds all SQL columns for channelmonitorrequesttemplate fields.
+var Columns = []string{
+	FieldID,
+	FieldCreatedAt,
+	FieldUpdatedAt,
+	FieldName,
+	FieldProvider,
+	FieldDescription,
+	FieldExtraHeaders,
+	FieldBodyOverrideMode,
+	FieldBodyOverride,
+}
+
+// ValidColumn reports if the column name is valid (part of the table columns).
+func ValidColumn(column string) bool {
+	for i := range Columns {
+		if column == Columns[i] {
+			return true
+		}
+	}
+	return false
+}
+
+var (
+	// DefaultCreatedAt holds the default value on creation for the "created_at" field.
+	DefaultCreatedAt func() time.Time
+	// DefaultUpdatedAt holds the default value on creation for the "updated_at" field.
+	DefaultUpdatedAt func() time.Time
+	// UpdateDefaultUpdatedAt holds the default value on update for the "updated_at" field.
+	UpdateDefaultUpdatedAt func() time.Time
+	// NameValidator is a validator for the "name" field. It is called by the builders before save.
+	NameValidator func(string) error
+	// DefaultDescription holds the default value on creation for the "description" field.
+	DefaultDescription string
+	// DescriptionValidator is a validator for the "description" field. It is called by the builders before save.
+	DescriptionValidator func(string) error
+	// DefaultExtraHeaders holds the default value on creation for the "extra_headers" field.
+	DefaultExtraHeaders map[string]string
+	// DefaultBodyOverrideMode holds the default value on creation for the "body_override_mode" field.
+	DefaultBodyOverrideMode string
+	// BodyOverrideModeValidator is a validator for the "body_override_mode" field. It is called by the builders before save.
+	BodyOverrideModeValidator func(string) error
+)
+
+// Provider defines the type for the "provider" enum field.
+type Provider string
+
+// Provider values.
+const (
+	ProviderOpenai    Provider = "openai"
+	ProviderAnthropic Provider = "anthropic"
+	ProviderGemini    Provider = "gemini"
+)
+
+func (pr Provider) String() string {
+	return string(pr)
+}
+
+// ProviderValidator is a validator for the "provider" field enum values. It is called by the builders before save.
+func ProviderValidator(pr Provider) error {
+	switch pr {
+	case ProviderOpenai, ProviderAnthropic, ProviderGemini:
+		return nil
+	default:
+		return fmt.Errorf("channelmonitorrequesttemplate: invalid enum value for provider field: %q", pr)
+	}
+}
+
+// OrderOption defines the ordering options for the ChannelMonitorRequestTemplate queries.
+type OrderOption func(*sql.Selector)
+
+// ByID orders the results by the id field.
+func ByID(opts ...sql.OrderTermOption) OrderOption {
+	return sql.OrderByField(FieldID, opts...).ToFunc()
+}
+
+// ByCreatedAt orders the results by the created_at field.
+func ByCreatedAt(opts ...sql.OrderTermOption) OrderOption {
+	return sql.OrderByField(FieldCreatedAt, opts...).ToFunc()
+}
+
+// ByUpdatedAt orders the results by the updated_at field.
+func ByUpdatedAt(opts ...sql.OrderTermOption) OrderOption {
+	return sql.OrderByField(FieldUpdatedAt, opts...).ToFunc()
+}
+
+// ByName orders the results by the name field.
+func ByName(opts ...sql.OrderTermOption) OrderOption {
+	return sql.OrderByField(FieldName, opts...).ToFunc()
+}
+
+// ByProvider orders the results by the provider field.
+func ByProvider(opts ...sql.OrderTermOption) OrderOption {
+	return sql.OrderByField(FieldProvider, opts...).ToFunc()
+}
+
+// ByDescription orders the results by the description field.
+func ByDescription(opts ...sql.OrderTermOption) OrderOption {
+	return sql.OrderByField(FieldDescription, opts...).ToFunc()
+}
+
+// ByBodyOverrideMode orders the results by the body_override_mode field.
+func ByBodyOverrideMode(opts ...sql.OrderTermOption) OrderOption {
+	return sql.OrderByField(FieldBodyOverrideMode, opts...).ToFunc()
+}
+
+// ByMonitorsCount orders the results by monitors count.
+func ByMonitorsCount(opts ...sql.OrderTermOption) OrderOption {
+	return func(s *sql.Selector) {
+		sqlgraph.OrderByNeighborsCount(s, newMonitorsStep(), opts...)
+	}
+}
+
+// ByMonitors orders the results by monitors terms.
+func ByMonitors(term sql.OrderTerm, terms ...sql.OrderTerm) OrderOption {
+	return func(s *sql.Selector) {
+		sqlgraph.OrderByNeighborTerms(s, newMonitorsStep(), append([]sql.OrderTerm{term}, terms...)...)
+	}
+}
+func newMonitorsStep() *sqlgraph.Step {
+	return sqlgraph.NewStep(
+		sqlgraph.From(Table, FieldID),
+		sqlgraph.To(MonitorsInverseTable, FieldID),
+		sqlgraph.Edge(sqlgraph.O2M, true, MonitorsTable, MonitorsColumn),
+	)
+}