feat: add rules module to count project config files

[knqiufan]

Summary

• Add a new "规则" (Rules) status bar module that counts CLAUDE.md files, .claude/ directory contents, and skills/ directory contents
• Display shows total count with a muted breakdown: [规则] 15 规则:12 Skill:3
• CLI commands: pulse-line rules (summary), pulse-line rules list (file listing), pulse-line rules pattern add/remove (pattern management)
• Config schema migration v6 → v7, all 5 themes updated, full i18n support

Changes

Type	File	Description
New	src/extractors/rules.ts	Core extractor: scan CLAUDE.md + .claude/ + skills/
New	test/rules.test.ts	12 test cases
New	commands/rules.md	CLI command documentation
Edit	src/types/pulse-config.ts	RulesModuleConfig type + schema v7
Edit	src/index.ts	Wire module into render pipeline
Edit	src/cli.ts	rules/list/pattern commands
Edit	5 theme files + 2 icon sets + themes/index.ts	Full theme support
Edit	i18n, migration, display-sanitize	Supporting infrastructure

Test plan

• 127 tests pass (12 new + 6 updated migrate-config tests)
• TypeScript compiles with zero errors
• pulse-line rules shows summary
• pulse-line rules list shows categorized file list
• pulse-line rules pattern add/remove manages include/exclude patterns
• Empty project returns 0
• Nested CLAUDE.md files detected
• Default directories (node_modules, .git, etc.) excluded

Closes #2

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