refactor: frontend TS migration + Tailwind4/daisyUI5 unify + BUILDPLATFORM docker build

- migrate frontend to TypeScript (vue-tsc strict in build), upgrade all deps to latest (Vite 8, Tailwind 4, daisyUI 5, Pinia 4, vue-router 5)
- restructure frontend dirs (api/components/common/layouts/styles/types/views)
- drop Element Plus, add daisyUI TagInput; main CSS 490KB->163KB, entry JS 618KB->1.3KB
- rewrite Dockerfile(.cn): frontend/backend stages pinned to $BUILDPLATFORM, CGO_ENABLED=0 cross-compile, no QEMU in multi-arch builds; add .dockerignore
- local dev: Vite /api proxy + make dev targets; go:embed all:dist with .gitkeep so backend runs without prior frontend build
- fix latent bugs: Keys.vue users ref, Settings.vue undefined userStore, Login.vue Ref-as-error display, res.error misuse
- add REFACTOR_PLAN.md (phased refactor log)

makefile

@@ -16,17 +16,36 @@ LDFlags=" \
 -X 'main.BuildGoVersion=$(BuildGoVersion)'"
 
 .PHONY: web
-# web
+# 构建前端并放入 Go embed 目录 (cmd/openteam/dist)
 web:
-	cd frontend && npm install -g pnpm && pnpm build && mv dist ../cmd/openteam/
-	
+	cd frontend && (command -v pnpm >/dev/null 2>&1 || npm install -g pnpm) && pnpm install --frozen-lockfile && pnpm build
+	rm -rf cmd/openteam/dist
+	mkdir -p cmd/openteam
+	mv frontend/dist cmd/openteam/dist
+	touch cmd/openteam/dist/.gitkeep
+
+.PHONY: dev-backend
+# 本地启动后端 (端口 8080, 数据库 ./db/openteam.db)
+dev-backend:
+	PORT=8080 go run ./cmd/openteam
+
+.PHONY: dev-frontend
+# 本地启动前端 dev server (端口 5173, /api 代理到后端)
+dev-frontend:
+	cd frontend && pnpm dev
+
+.PHONY: dev
+# 并行启动前后端本地开发环境 (Ctrl+C 一起退出)
+dev:
+	$(MAKE) -j2 dev-backend dev-frontend
+
 .PHONY: build
 # build
 build:
 # mkdir -p bin/ && go build -ldflags $(LDFlags) -o ./bin/ ./...
-	rm -rf  bin 
-	mkdir -p bin/  &&  go build -ldflags "-s -w" -o ./bin/openteam ./cmd/openteam/
-	upx -9 bin/openteam
+	rm -rf  bin
+	mkdir -p bin/  &&  CGO_ENABLED=0 go build -ldflags "-s -w" -o ./bin/openteam ./cmd/openteam/
+	command -v upx >/dev/null 2>&1 && upx -9 bin/openteam || echo "upx 未安装，跳过二进制压缩"
 
 .PHONY:image
 # build docker images