feat: allow per-module log level overrides

[Miss-you]

Logging 功能方案概述

在配置层新增 logging.levels：Config 增加 LoggingConfig，允许用户在 ~/.kimi/config.json 中声明 模块前缀 -> 日志级别 映射。模块名会被裁剪+小写化，级别在载入时校验，保证默认行为兼容。
CLI 提供 -L/--log-level：Typer 入口接受重复参数，支持 LEVEL（默认域）和 module=LEVEL（大小写不敏感）。CLI 启动时合并配置和命令行覆盖，--debug 仍然把默认级别提升到 TRACE。
日志初始化重写：configure_file_logging 创建单一 loguru sink，并挂上 _ModuleLevelFilter。过滤器根据源码路径推导模块名，按最长前缀匹配决定阈值，未命中时落在 default；还会自动创建 ~/.kimi/logs。
Runtime 复用配置：KimiCLI.create 接受外部传入的 Config，避免重复加载，确保日志设置贯穿 CLI 生命周期。
文档与校验：README 新增 “Logging configuration” 章节说明 CLI/配置用法，任务文档写明验证步骤。新增 tests/test_logging_levels.py 验证解析与过滤逻辑，tests/test_config.py 更新默认配置快照；make check/test 融合新行为。

代码改动位置

src/kimi_cli/config.py: 添加 LoggingConfig 与验证逻辑，Config 默认值包含 logging。
src/kimi_cli/utils/logging.py: 新增 configure_file_logging、_ModuleLevelFilter 等核心实现，支持大小写无关和前缀匹配。
src/kimi_cli/cli.py: Typer 入口插入 --log-level 选项、合并配置、调用 configure_file_logging，并在错误时抛出 typer.BadParameter。
src/kimi_cli/app.py: KimiCLI.create 允许传入已有 Config。
文档、任务说明、测试文件等同步更新，确保功能可见且覆盖完整。

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Logging function solution overview

Added logging.levels:Config in the configuration layer. Added LoggingConfig to allow users to declare module prefix -> log level mapping in ~/.kimi/config.json. The module name will be truncated + lowercase, and the level will be verified when loading to ensure that the default behavior is compatible.
CLI provides -L/--log-level: Typer entry accepts repeated parameters and supports LEVEL (default domain) and module=LEVEL (case-insensitive). CLI startup merges configuration and command line overrides, --debug still raises the default level to TRACE.
Log initialization rewrite: configure_file_logging creates a single loguru sink and mounts _ModuleLevelFilter. The filter deduces the module name based on the source code path, and determines the threshold based on the longest prefix match. If it misses, it falls to default; ~/.kimi/logs will also be automatically created.
Runtime reuse configuration: KimiCLI.create accepts external incoming Config to avoid repeated loading and ensure that log settings last throughout the CLI life cycle.
Documentation and verification: README adds a new "Logging configuration" chapter to explain CLI/configuration usage, and the task document describes verification steps. Added tests/test_logging_levels.py to verify parsing and filtering logic, tests/test_config.py to update the default configuration snapshot; make check/test to integrate new behaviors.

Code change location

src/kimi_cli/config.py: Add LoggingConfig and verification logic. The default value of Config includes logging.
src/kimi_cli/utils/logging.py: Added core implementations such as configure_file_logging and _ModuleLevelFilter to support case-independence and prefix matching.
src/kimi_cli/cli.py: Typer entry inserts the --log-level option, merges configurations, calls configure_file_logging, and throws typer.BadParameter on error.
src/kimi_cli/app.py: KimiCLI.create allows passing in existing Config.
Documents, task descriptions, test files, etc. are updated simultaneously to ensure that functions are visible and fully covered.

[Copilot]

Pull Request Overview

This PR implements configurable logging levels for the Kimi CLI, allowing users to set different log levels for different modules through both configuration files and command-line options.

• Adds support for per-module log level configuration via ~/.kimi/config.json and CLI flags
• Implements a filtering mechanism that respects module hierarchies (more specific prefixes override general ones)
• Provides comprehensive test coverage for the new logging functionality

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/kimi_cli/utils/logging.py	Implements core logging configuration functionality including file logging setup, level normalization, and module-based filtering
src/kimi_cli/config.py	Adds LoggingConfig class with validation for log level configuration in the config file
src/kimi_cli/cli.py	Adds --log-level/-L CLI option, merges config and CLI logging settings, and passes configuration to the app
src/kimi_cli/app.py	Updates KimiCLI.create() to accept an optional preloaded Config parameter to avoid double-loading
tests/test_logging_levels.py	Adds comprehensive tests for log level parsing and module-based filtering behavior
tests/test_config.py	Updates config tests to include the new LoggingConfig field in expected outputs
README.md	Documents the new logging configuration feature with examples for both CLI and config file usage

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[stdrc]

This solution looks too complex to me😱

[stdrc]

Let's use the least lines of code to accomplish similar level of functionality.