feat: 初始化Webhook中继系统项目

- 添加FastAPI应用基础结构，包括主入口、路由和模型定义
- 实现Webhook接收端点(/webhook/{namespace})和健康检查(/health)
- 添加管理后台路由和模板，支持端点、目标、渠道和模板管理
- 包含SQLite数据库模型定义和初始化逻辑
- 添加日志记录和统计服务
- 包含Dockerfile和配置示例文件
- 添加项目文档，包括设计、流程图和验收标准

templates/admin/endpoints.html

@@ -0,0 +1,124 @@
+{% extends "admin/base.html" %}
+{% block title %}端点管理 - Webhook{% endblock %}
+{% block content %}
+<div class="row mb-3">
+    <div class="col">
+        <h3>接收端点 (Endpoints)</h3>
+    </div>
+    <div class="col-auto">
+        <button type="button" class="btn btn-primary" data-bs-toggle="modal" data-bs-target="#addModal">添加端点</button>
+    </div>
+</div>
+
+<div class="alert alert-info alert-dismissible fade show" role="alert">
+    <strong>什么是“接收端点”？</strong>
+    <p class="mb-0">
+        接收端点（Endpoints）是<strong>外部系统向本服务发送Webhook数据的入口地址</strong>。<br>
+        <strong>Namespace</strong>：URL路径的唯一标识。例如创建 namespace 为 <code>client_a</code>，则外部请求地址为 <code>/webhook/client_a</code>。<br>
+        <strong>流程配置</strong>：点击列表中的 <span class="badge bg-info text-dark">Namespace</span> 或 <button class="btn btn-sm btn-outline-primary py-0 px-1">⚙️ 配置</button> 按钮，进入端点的规则编排页面。
+    </p>
+    <button type="button" class="btn-close" data-bs-dismiss="alert" aria-label="Close"></button>
+</div>
+
+<table class="table table-striped">
+    <thead>
+        <tr>
+            <th>ID</th>
+            <th>Namespace</th>
+            <th>完整URL示例</th>
+            <th>描述</th>
+            <th>状态</th>
+            <th>创建时间</th>
+            <th>操作</th>
+        </tr>
+    </thead>
+    <tbody>
+        {% for e in endpoints %}
+        <tr>
+            <td>{{ e.id }}</td>
+            <td><a href="/admin/endpoints/{{ e.id }}" class="text-decoration-none"><span class="badge bg-info text-dark fs-6">{{ e.namespace }}</span></a></td>
+            <td>
+                <code>/webhook/{{ e.namespace }}</code>
+                <button class="btn btn-sm btn-link text-decoration-none copy-btn" data-path="/webhook/{{ e.namespace }}" title="复制完整URL">📋</button>
+            </td>
+            <td>{{ e.description or '-' }}</td>
+            <td>
+                {% if e.is_active %}
+                <span class="badge bg-success">启用</span>
+                {% else %}
+                <span class="badge bg-secondary">禁用</span>
+                {% endif %}
+            </td>
+            <td>{{ e.created_at.strftime('%Y-%m-%d %H:%M') }}</td>
+            <td>
+                <a href="/admin/endpoints/{{ e.id }}" class="btn btn-sm btn-outline-primary">⚙️ 配置</a>
+                <form action="/admin/endpoints/toggle" method="post" style="display:inline">
+                    <input type="hidden" name="id" value="{{ e.id }}">
+                    {% if e.is_active %}
+                    <button type="submit" class="btn btn-sm btn-warning">禁用</button>
+                    {% else %}
+                    <button type="submit" class="btn btn-sm btn-success">启用</button>
+                    {% endif %}
+                </form>
+                <form action="/admin/endpoints/delete" method="post" style="display:inline" onsubmit="return confirm('确定删除？')">
+                    <input type="hidden" name="id" value="{{ e.id }}">
+                    <button type="submit" class="btn btn-sm btn-danger">删除</button>
+                </form>
+            </td>
+        </tr>
+        {% endfor %}
+    </tbody>
+</table>
+
+<!-- Add Modal -->
+<div class="modal fade" id="addModal" tabindex="-1">
+    <div class="modal-dialog">
+        <form action="/admin/endpoints" method="post">
+            <div class="modal-content">
+                <div class="modal-header">
+                    <h5 class="modal-title">创建新端点</h5>
+                    <button type="button" class="btn-close" data-bs-dismiss="modal"></button>
+                </div>
+                <div class="modal-body">
+                    <div class="mb-3">
+                        <label class="form-label">Namespace (URL路径的一部分)</label>
+                        <input type="text" class="form-control" name="namespace" required placeholder="my-service-1">
+                        <div class="form-text">只能包含字母、数字、下划线或连字符。</div>
+                    </div>
+                    <div class="mb-3">
+                        <label class="form-label">描述</label>
+                        <input type="text" class="form-control" name="description" placeholder="用于XX业务接收">
+                    </div>
+                </div>
+                <div class="modal-footer">
+                    <button type="button" class="btn btn-secondary" data-bs-dismiss="modal">取消</button>
+                    <button type="submit" class="btn btn-primary">保存</button>
+                </div>
+            </div>
+        </form>
+    </div>
+</div>
+
+<script>
+    document.addEventListener('DOMContentLoaded', function() {
+        document.querySelectorAll('.copy-btn').forEach(btn => {
+            btn.addEventListener('click', function() {
+                const path = this.getAttribute('data-path');
+                // Construct full URL based on current window location
+                const fullUrl = window.location.origin + path;
+                
+                navigator.clipboard.writeText(fullUrl).then(() => {
+                    const originalContent = this.innerHTML;
+                    this.innerHTML = '✅';
+                    setTimeout(() => {
+                        this.innerHTML = originalContent;
+                    }, 1500);
+                }).catch(err => {
+                    console.error('Failed to copy: ', err);
+                    alert('复制失败，请手动复制');
+                });
+            });
+        });
+    });
+</script>
+{% endblock %}