feat: bootstrap temporserv project scaffold

Add the initial project blueprint, Go backend skeleton, frontend app shell, database schema draft, and local development/deployment files.

internal/auth/service.go

@@ -0,0 +1,23 @@
+package auth
+
+import "time"
+
+type User struct {
+	ID          string    `json:"id"`
+	Username    string    `json:"username"`
+	IsAdmin     bool      `json:"isAdmin"`
+	CreatedAt   time.Time `json:"createdAt"`
+	LastLoginAt time.Time `json:"lastLoginAt"`
+}
+
+func DemoUser() User {
+	now := time.Now().UTC()
+	return User{
+		ID:          "user-demo",
+		Username:    "demo",
+		IsAdmin:     true,
+		CreatedAt:   now,
+		LastLoginAt: now,
+	}
+}
+