feat(dashboard): add boss dashboard H5 and APIs

Implement the mobile dashboard frontend, admin overview APIs, report archive export, and local dev proxy so the boss dashboard can run against real backend data while preserving MSW demos.

Co-authored-by: Cursor <cursoragent@cursor.com>

dashboard-frontend/.gitignore

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+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+lerna-debug.log*
+
+node_modules
+dist
+dist-ssr
+*.local
+
+# Editor directories and files
+.vscode/*
+!.vscode/extensions.json
+.idea
+.DS_Store
+*.suo
+*.ntvs*
+*.njsproj
+*.sln
+*.sw?