baseline: Clover 独立仓库首次基线提交

将 Clover 从上层产品包旧仓库中独立出来,建立专属版本控制。
当前状态=纵切片端到端已打通(登录→选品→出文出图→审核→下载包),
M1文案质量去套路化已验收。此提交作为后续按核销清单逐条修复的基线。

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

backend/nginx/nginx.conf

@@ -0,0 +1,36 @@
+# nginx/nginx.conf — Clover 反向代理配置
+# SSE 端点需关闭 proxy_buffering 才能实时透传
+
+server {
+    listen 80;
+    server_name _;
+
+    # ── SSE 端点：关闭缓冲，实时透传 ──────────────────
+    location ~* /api/v1/tasks/[^/]+/stream {
+        proxy_pass         http://api:8000;
+        proxy_http_version 1.1;
+        proxy_set_header   Connection "";
+        proxy_buffering    off;
+        proxy_cache        off;
+        proxy_read_timeout 3600s;
+        proxy_set_header   Host $host;
+        proxy_set_header   X-Real-IP $remote_addr;
+        proxy_set_header   Authorization $http_authorization;
+    }
+
+    # ── 普通 API 端点 ──────────────────────────────────
+    location /api/ {
+        proxy_pass         http://api:8000;
+        proxy_http_version 1.1;
+        proxy_set_header   Host $host;
+        proxy_set_header   X-Real-IP $remote_addr;
+        proxy_set_header   X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header   Authorization $http_authorization;
+        client_max_body_size 20m;
+    }
+
+    # ── 健康检查 ───────────────────────────────────────
+    location /health {
+        proxy_pass http://api:8000/health;
+    }
+}