feat(claude): upgrade effort toggle from "high" to "max"

Per Anthropic's effort parameter docs, "high" is the API default and
setting effortLevel="high" is equivalent to omitting the field entirely.
The toggle previously produced no effect.

Claude Opus 4.6, Sonnet 4.6, and Opus 4.7 now support a "max" level
that enables unconstrained reasoning. Rename the checkbox (effortHigh
-> effortMax) and write effortLevel="max" when toggled on. Existing
"high" values in user configs are left untouched.

Updates zh/en/ja locales and user-manual entries accordingly.

docs/user-manual/zh/2-providers/2.1-add.md

@@ -509,7 +509,7 @@ v3.13.0 起新增的高级选项。默认情况下，CC Switch 会把配置的 `
 | **隐藏署名** | 清除提交/PR 的署名元数据 | 设置 `attribution: {commit: "", pr: ""}` |
 | **启用 Teammates** | 启用 Agent 团队功能 | 设置 `env.CLAUDE_CODE_EXPERIMENTAL_AGENT_TEAMS = "1"` |
 | **启用工具搜索** | 启用工具搜索功能 | 设置 `env.ENABLE_TOOL_SEARCH = "true"` |
-| **高效能模式** | 将 effort 级别设为 high | 设置 `effortLevel = "high"` |
+| **最大强度思考** | 将 effort 级别设为 max | 设置 `effortLevel = "max"` |
 | **禁用自动更新** | 阻止 Claude Code 自动更新 | 设置 `env.DISABLE_AUTOUPDATER = "1"` |
 
 取消勾选开关时，对应的配置项会被完全移除。更改会实时反映在 JSON 编辑器中。