fix: add web/src/lib/api/ split files and fix .gitignore

The .gitignore had a Python-inherited `lib/` rule that blocked the
entire web/src/lib/api/ directory from being tracked. The original
api.ts was a file (not matched), but the split created a directory
inside lib/ which was ignored. Remove the `lib/` gitignore rule and
add the api module split files that were missing from the previous commit.

web/src/lib/api/strategies.ts

@@ -0,0 +1,72 @@
+import type {
+  Strategy,
+  StrategyConfig,
+} from '../../types'
+import { API_BASE, httpClient } from './helpers'
+
+export const strategyApi = {
+  async getStrategies(): Promise<Strategy[]> {
+    const result = await httpClient.get<{ strategies: Strategy[] }>(`${API_BASE}/strategies`)
+    if (!result.success) throw new Error('获取策略列表失败')
+    const strategies = result.data?.strategies
+    return Array.isArray(strategies) ? strategies : []
+  },
+
+  async getStrategy(strategyId: string): Promise<Strategy> {
+    const result = await httpClient.get<Strategy>(`${API_BASE}/strategies/${strategyId}`)
+    if (!result.success) throw new Error('获取策略失败')
+    return result.data!
+  },
+
+  async getActiveStrategy(): Promise<Strategy> {
+    const result = await httpClient.get<Strategy>(`${API_BASE}/strategies/active`)
+    if (!result.success) throw new Error('获取激活策略失败')
+    return result.data!
+  },
+
+  async getDefaultStrategyConfig(): Promise<StrategyConfig> {
+    const result = await httpClient.get<StrategyConfig>(`${API_BASE}/strategies/default-config`)
+    if (!result.success) throw new Error('获取默认策略配置失败')
+    return result.data!
+  },
+
+  async createStrategy(data: {
+    name: string
+    description: string
+    config: StrategyConfig
+  }): Promise<Strategy> {
+    const result = await httpClient.post<Strategy>(`${API_BASE}/strategies`, data)
+    if (!result.success) throw new Error('创建策略失败')
+    return result.data!
+  },
+
+  async updateStrategy(
+    strategyId: string,
+    data: {
+      name?: string
+      description?: string
+      config?: StrategyConfig
+    }
+  ): Promise<Strategy> {
+    const result = await httpClient.put<Strategy>(`${API_BASE}/strategies/${strategyId}`, data)
+    if (!result.success) throw new Error('更新策略失败')
+    return result.data!
+  },
+
+  async deleteStrategy(strategyId: string): Promise<void> {
+    const result = await httpClient.delete(`${API_BASE}/strategies/${strategyId}`)
+    if (!result.success) throw new Error('删除策略失败')
+  },
+
+  async activateStrategy(strategyId: string): Promise<Strategy> {
+    const result = await httpClient.post<Strategy>(`${API_BASE}/strategies/${strategyId}/activate`)
+    if (!result.success) throw new Error('激活策略失败')
+    return result.data!
+  },
+
+  async duplicateStrategy(strategyId: string): Promise<Strategy> {
+    const result = await httpClient.post<Strategy>(`${API_BASE}/strategies/${strategyId}/duplicate`)
+    if (!result.success) throw new Error('复制策略失败')
+    return result.data!
+  },
+}