feat(apisix): add Cloudron package

- Implements Apache APISIX packaging for Cloudron platform.
- Includes Dockerfile, CloudronManifest.json, and start.sh.
- Configured to use Cloudron's etcd addon.

🤖 Generated with Gemini CLI
Co-Authored-By: Gemini <noreply@google.com>

CloudronPackages/APISIX/apisix-source/docs/zh/latest/customize-nginx-configuration.md

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+---
+title: 自定义 Nginx 配置
+---
+
+<!--
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
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+# The ASF licenses this file to You under the Apache License, Version 2.0
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+-->
+
+APISIX 使用的 Nginx 配置是通过模板文件 `apisix/cli/ngx_tpl.lua` 以及 `apisix/cli/config.lua` 和`conf/config.yaml` 中的参数生成的。
+
+在执行完 `./bin/apisix start`，你可以在 `conf/nginx.conf` 看到生成的 Nginx 配置文件。
+
+如果你需要自定义 Nginx 配置，请阅读 `conf/config.default.example` 中的 `nginx_config`。你可以在 `conf/config.yaml` 中覆盖默认值。例如，你可以在 `conf/nginx.conf` 中通过配置 `xxx_snippet` 条目注入一些代码片段：
+
+```yaml
+...
+# config.yaml 里面的内容
+nginx_config:
+    main_configuration_snippet: |
+        daemon on;
+    http_configuration_snippet: |
+        server
+        {
+            listen 45651;
+            server_name _;
+            access_log off;
+
+            location /ysec_status {
+                req_status_show;
+                allow 127.0.0.1;
+                deny all;
+            }
+        }
+
+        chunked_transfer_encoding on;
+
+    http_server_configuration_snippet: |
+        set $my "var";
+    http_admin_configuration_snippet: |
+        log_format admin "$request_time $pipe";
+    http_end_configuration_snippet: |
+        server_names_hash_bucket_size 128;
+    stream_configuration_snippet: |
+        tcp_nodelay off;
+...
+```
+
+注意`nginx_config`及其子项的格式缩进，在执行`./bin/apisix start`时，错误的缩进将导致更新`conf/nginx.conf`文件失败。