Initial commit — taskboard base (health endpoint)

Gin server on port 8095 with /health route. CRUD task endpoints
to be added via plan/62-taskboard-crud.

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

main.go

@@ -0,0 +1,40 @@
+package main
+
+import (
+	"os"
+
+	"github.com/gin-gonic/gin"
+)
+
+func main() {
+	r := gin.Default()
+
+	// CORS for local dev
+	r.Use(func(c *gin.Context) {
+		c.Header("Access-Control-Allow-Origin", "*")
+		c.Header("Access-Control-Allow-Methods", "GET, POST, PUT, PATCH, DELETE, OPTIONS")
+		c.Header("Access-Control-Allow-Headers", "Content-Type, Authorization")
+		if c.Request.Method == "OPTIONS" {
+			c.AbortWithStatus(204)
+			return
+		}
+		c.Next()
+	})
+
+	r.POST("/tasks", CreateTask)
+	r.GET("/tasks", ListTasks)
+	r.GET("/tasks/:id", GetTask)
+	r.PATCH("/tasks/:id", UpdateTask)
+	r.DELETE("/tasks/:id", DeleteTask)
+
+	r.GET("/health", func(c *gin.Context) {
+		c.JSON(200, gin.H{"status": "ok"})
+	})
+
+	port := os.Getenv("PORT")
+	if port == "" {
+		port = "8095"
+	}
+
+	r.Run(":" + port)
+}