feat: 增加 SafeW 已监控群列表接口

通过 getUpdates 将群写入 Redis，供创建/编辑渠道时选择 chat_id，避免前端重复传递 token。

internal/safew/store.go

@@ -0,0 +1,88 @@
+package safew
+
+import (
+	"context"
+	"sync"
+	"time"
+
+	"aiaa-notification-service/internal/adapter"
+)
+
+type ChatStore interface {
+	MergeSafewChats(ctx context.Context, token string, chats []adapter.SafewChat) error
+	ListSafewChats(ctx context.Context, token string) ([]adapter.SafewChat, error)
+	GetSafewOffset(ctx context.Context, token string) (int64, error)
+	SetSafewOffset(ctx context.Context, token string, offset int64) error
+	TrySafewPollLock(ctx context.Context, token string, ttl time.Duration) (bool, error)
+	UnlockSafewPoll(ctx context.Context, token string) error
+}
+
+type MemStore struct {
+	mu     sync.Mutex
+	chats  map[string]map[string]adapter.SafewChat
+	offset map[string]int64
+	locks  map[string]bool
+}
+
+func NewMemStore() *MemStore {
+	return &MemStore{
+		chats:  map[string]map[string]adapter.SafewChat{},
+		offset: map[string]int64{},
+		locks:  map[string]bool{},
+	}
+}
+
+func (m *MemStore) MergeSafewChats(_ context.Context, token string, chats []adapter.SafewChat) error {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	if m.chats[token] == nil {
+		m.chats[token] = map[string]adapter.SafewChat{}
+	}
+	for _, c := range chats {
+		m.chats[token][c.ID] = c
+	}
+	return nil
+}
+
+func (m *MemStore) ListSafewChats(_ context.Context, token string) ([]adapter.SafewChat, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	var out []adapter.SafewChat
+	for _, c := range m.chats[token] {
+		out = append(out, c)
+	}
+	if out == nil {
+		out = []adapter.SafewChat{}
+	}
+	return out, nil
+}
+
+func (m *MemStore) GetSafewOffset(_ context.Context, token string) (int64, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	return m.offset[token], nil
+}
+
+func (m *MemStore) SetSafewOffset(_ context.Context, token string, offset int64) error {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	m.offset[token] = offset
+	return nil
+}
+
+func (m *MemStore) TrySafewPollLock(_ context.Context, token string, _ time.Duration) (bool, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	if m.locks[token] {
+		return false, nil
+	}
+	m.locks[token] = true
+	return true, nil
+}
+
+func (m *MemStore) UnlockSafewPoll(_ context.Context, token string) error {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	delete(m.locks, token)
+	return nil
+}