✨ feat: add @manacore/shared-api-client package

Create unified API client for all web apps with:
- createApiClient factory function
- ApiResult<T> Go-style error handling
- HTTP methods: get, post, put, patch, delete, upload
- Auto token handling via getAuthToken callback
- Timeout support with AbortController
- Retry logic with exponential backoff
- Runtime URL injection for Docker
- FormData support for file uploads

Migrate clock app as proof of concept:
- Replace local fetchApi with shared createApiClient
- Update stores to use ApiError.message

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

packages/shared-api-client/tsconfig.json

@@ -6,6 +6,7 @@
 		"strict": true,
 		"esModuleInterop": true,
 		"skipLibCheck": true,
+		"forceConsistentCasingInFileNames": true,
 		"declaration": true,
 		"declarationMap": true,
 		"outDir": "./dist",