chore(init): 初始化解忧商行项目并完成 Phase 0 基座

.gitignore

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+# dependencies
+node_modules/
+
+# builds
+dist/
+frontend/dist/
+distribution-admin/dist/
+
+# local env / secrets
+backend/.env
+backend/.env.*
+!backend/.env.example
+!backend/.env.prod.example
+frontend/.env.local
+frontend/.env.*.local
+
+# logs / runtime
+logs/
+backend/logs/
+.snow/
+*.log
+
+# tooling
+.DS_Store
+coverage/
+tmp/
+.gocache/
+
+# TypeScript incremental build info
+*.tsbuildinfo
+
+# deployment backups / local data
+deploy/backup/
+
+# vite cache
+.vite/