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

README.md

@@ -0,0 +1,38 @@
+# Ahsarah Guide (阿萨拉向导)
+
+Ahsarah Guide is a full-stack web application for browsing and managing firearm modification guides.
+
+## Monorepo Structure
+
+| Directory | Stack | Description |
+|-----------|-------|-------------|
+| `server/` | Java 21 + Spring Boot 3.5 + Gradle | REST API backend |
+| `web/` | React 19 + Vite 8 + TypeScript + Ant Design 6 | Web frontend |
+
+## Quick Start
+
+### Server
+
+Prerequisites: JDK 21 (Amazon Corretto), PostgreSQL, Redis
+
+```bash
+cd server
+cp config/application-prod.yaml.example config/application-dev.yaml
+# Edit config/application-dev.yaml with your database and Redis credentials
+./gradlew bootJar
+java -jar build/libs/ahsarah-guide-server-*.jar
+```
+
+### Web
+
+Prerequisites: Node.js 20+, pnpm
+
+```bash
+cd web
+pnpm install
+pnpm dev
+```
+
+## Licence
+
+MIT. See [LICENCE](LICENCE) for details.