Initial commit: Gitea Project Management System

Features:
- Complete project management system with Epic/Story/Task hierarchy
- Vue.js 3 + Element Plus frontend with kanban board
- Go backend with Gin framework and GORM
- OAuth2 integration with Gitea
- Docker containerization with MySQL
- RESTful API for project, task, and user management
- JWT authentication and authorization
- Responsive web interface with dashboard

internal/api/handlers/epics.go

@@ -0,0 +1,59 @@
+package handlers
+
+import (
+	"net/http"
+	"strconv"
+
+	"giteapm/internal/models"
+
+	"github.com/gin-gonic/gin"
+)
+
+func (h *Handlers) ListEpics(c *gin.Context) {
+	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
+	limit, _ := strconv.Atoi(c.DefaultQuery("limit", "20"))
+	offset := (page - 1) * limit
+
+	filters := make(map[string]interface{})
+	if projectID := c.Query("project_id"); projectID != "" {
+		if id, err := strconv.ParseUint(projectID, 10, 32); err == nil {
+			filters["project_id"] = uint(id)
+		}
+	}
+
+	epics, total, err := models.ListEpics(offset, limit, filters)
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, ErrorResponse(500, "获取Epic列表失败"))
+		return
+	}
+
+	c.JSON(http.StatusOK, PaginatedSuccessResponse(epics, total, page, limit))
+}
+
+func (h *Handlers) CreateEpic(c *gin.Context) {
+	c.JSON(http.StatusNotImplemented, ErrorResponse(501, "功能暂未实现"))
+}
+
+func (h *Handlers) GetEpic(c *gin.Context) {
+	id, err := strconv.ParseUint(c.Param("id"), 10, 32)
+	if err != nil {
+		c.JSON(http.StatusBadRequest, ErrorResponse(400, "无效的Epic ID"))
+		return
+	}
+
+	epic, err := models.GetEpicByID(uint(id))
+	if err != nil {
+		c.JSON(http.StatusNotFound, ErrorResponse(404, "Epic不存在"))
+		return
+	}
+
+	c.JSON(http.StatusOK, SuccessResponse(epic))
+}
+
+func (h *Handlers) UpdateEpic(c *gin.Context) {
+	c.JSON(http.StatusNotImplemented, ErrorResponse(501, "功能暂未实现"))
+}
+
+func (h *Handlers) DeleteEpic(c *gin.Context) {
+	c.JSON(http.StatusNotImplemented, ErrorResponse(501, "功能暂未实现"))
+}