feat: bootstrap OSDB full-stack skeleton (story #01)

- Go backend: Echo v4 + pgxpool + embedded golang-migrate; health endpoints
  at /health and /api/v1/health; TDD health handler (httptest)
- Vue 3 frontend: Vite + TypeScript + Pinia + vue-router + Tailwind CSS v4;
  TDD HelloWorld component (@vue/test-utils + jsdom + vitest)
- Infra: docker-compose postgres:16 with env-interpolated credentials;
  Makefile with dev-db health-wait loop, migrate-up/down, run, test, fmt
- embed.FS migrations at backend/migrations/ (000001 no-op baseline)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/cmd/server/router.go

@@ -0,0 +1,33 @@
+package main
+
+import (
+	"github.com/jackc/pgx/v5/pgxpool"
+	"github.com/labstack/echo/v4"
+	"github.com/labstack/echo/v4/middleware"
+
+	"osdb/internal/handler"
+)
+
+// New creates and configures the Echo instance with all routes registered.
+// Extension point: story #2, #4, #7, #8 route groups are added here.
+func New(pool *pgxpool.Pool) *echo.Echo {
+	e := echo.New()
+	e.HideBanner = true
+
+	// Global middleware
+	e.Use(middleware.Logger())
+	e.Use(middleware.Recover())
+
+	health := handler.NewHealthHandler()
+
+	// Root health — used by docker healthcheck + ops tooling
+	e.GET("/health", health.Health)
+
+	// Versioned API group
+	api := e.Group("/api/v1")
+	api.GET("/health", health.Health)
+
+	// Future story groups (fruits, publications, admin, auth) are added here.
+
+	return e
+}