refactor: rename delta-force-guide to ahsarah-guide and merge into monorepo

- Merge delta-force-guide-server into server/ subdirectory
- Merge delta-force-guide-web into web/ subdirectory
- Rename Java package com.onixbyte.deltaforceguide to com.onixbyte.ahsarahguide
- Rename DeltaForceGuideApplication to AhsarahGuideApplication
- Update all config files, Dockerfiles, and CI workflows
- Update frontend display name and repo links
- Update legal documents (EULA, PrivacyPolicy)
- Create root-level CLAUDE.md, README.md, LICENCE, .gitignore, .gitattributes
- Move CI workflows to root .gitea/workflows/ with working-directory
- Delete .gitlab-ci.yml (legacy)
- Preserve git history from both original repositories

web/index.html

@@ -4,7 +4,7 @@
     <meta charset="UTF-8" />
     <link rel="icon" type="image/svg+xml" href="/onixbyte.svg" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-    <title>《三角洲》指南</title>
+    <title>阿萨拉向导</title>
   </head>
   <body>
     <div id="root"></div>