feat: configurable Claude home directory and runtime model detection

[pennn778]

Summary

• Configurable Claude home directory: Replace all hardcoded .claude path references with a centralized claudePaths module that reads a configurable directory name. This allows users of custom CLI builds (e.g., claude-internal) that store data in ~/.claude-internal/ to configure the plugin accordingly. Includes settings UI, i18n support for all 10 locales, and 15 unit tests.
• Auto-detect available models from SDK at runtime: Replace the hardcoded model list with runtime detection via persistentQuery.supportedModels(), so claude-internal users see their actual available models. Priority: SDK models > env-var models > DEFAULT_CLAUDE_MODELS.
• Documentation updates: Update CLAUDE.md, README, and add Chinese translation (README_CN.md).

Changes

• Add src/utils/claudePaths.ts with get/set functions for the configurable dir name
• Convert static path constants in all 8 storage modules to dynamic functions
• Update PluginManager, AgentManager, sdkSession, and path utils to use dynamic paths
• Add ClaudianService.getSupportedModels() to fetch models from SDK
• Update ModelSelector to prefer SDK-detected models at runtime
• Add settings UI for Claude home directory (persisted to data.json to avoid bootstrap circularity)
• Bootstrap dir name in main.ts before loading settings
• Add i18n keys to all 10 locales
• Add unit tests for claudePaths, getSupportedModels, and InputToolbar SDK model integration

Test plan

• Unit tests pass
• Verify plugin loads with default .claude directory
• Change Claude home directory in settings to .claude-internal and verify storage paths update
• Verify model selector shows SDK-detected models when service is ready
• Verify fallback to env-var/default models when SDK models unavailable

[YishenTu]

PR review findings:

1. Critical: setClaudeHomeDirName is called on every keystroke

   • File: src/features/settings/ClaudianSettings.ts:626
   • TextComponent.onChange fires per-keystroke, but this mutates global path resolution immediately. Intermediate values (e.g. .c, .cl) can become active while user is typing.
   • Suggested fix: in settings UI, only persist value to data.json and show restart notice; avoid calling setClaudeHomeDirName() here.

2. Critical: bootstrap path applies persisted claudeHomeDirName without validation

   • File: src/main.ts:66 and src/main.ts:67
   • data.json is trusted directly; malformed/manual values can flow into global path resolution.
   • Suggested fix: validate before calling setter (or enforce validation inside setter).

3. High: mutation boundary has no validation

   • File: src/utils/claudePaths.ts:6
   • setClaudeHomeDirName(dirName: string) currently accepts arbitrary strings.
   • Suggested fix: enforce validation in setter itself (startsWith('.'), no / or \\, reject . and .., reject empty).

4. Important: current validation allows . and ..

   • File: src/features/settings/ClaudianSettings.ts:618
   • Current guard blocks separators but still allows . and ...
   • Suggested fix: reject both explicit values in the validation condition.

5. High: hardcoded command path remains in delete flow

   • File: src/core/storage/SlashCommandStorage.ts:52
   • delete() still uses COMMANDS_PATH instead of getCommandsPath(), so configurable Claude dir migration is incomplete for this code path.
   • Suggested fix: replace with dynamic path helper for consistency with the rest of the migration.

[pennn778]

Review feedback addressed

Pushed a fix commit (7ca68e1) addressing all 5 review comments:

Changes

1. Critical — setter called on every keystroke (comment Coming to Obsidian Community Plugins #1)

   • Settings UI no longer calls setClaudeHomeDirName() in onChange. Only persists the value to data.json; a restart is required for path changes to take effect.

2. Critical — bootstrap without validation (comment Fix Windows path comparisons and environment variable expansion #2)

   • setClaudeHomeDirName() now internally validates via isValidClaudeHomeDirName(). Invalid values from data.json are silently ignored (default .claude remains).

3. High — setter has no validation (comment feat: support concurrent title generation per conversation #3)

   • Added isValidClaudeHomeDirName() that rejects: empty strings, ., .., names without leading ., and names containing path separators (/, \).

4. Important — validation allows . and .. (comment Refactor test layout into unit/integration #4)

   • Settings UI validation now uses the shared isValidClaudeHomeDirName() which rejects both . and ...

5. High — hardcoded COMMANDS_PATH in delete flow (comment Show title model only when auto titles enabled and guard AI generation #5)

   • SlashCommandStorage.delete() now uses getCommandsPath(). The deprecated COMMANDS_PATH constant has been removed.

Verification

• All 4454 tests pass
• TypeScript type check passes
• Lint passes
• Build succeeds