Update repository URLs to Gitea

- Change all URLs from github.com to opensource.rogarithm.net
- Update Docker image references to local build (php-security-linter:latest)
- Fix Gitea Issues URL in CONTRIBUTING.md

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

README.md

@@ -28,7 +28,7 @@ No PHP or Composer environment required.
 
 ```bash
 # Clone the repository
-git clone https://github.com/security-linter/php-laravel.git
+git clone https://opensource.rogarithm.net/rogarithm/php-security-linter.git
 cd php-laravel-security-linter
 
 # Install (builds Docker image and installs command)
@@ -49,7 +49,7 @@ php-security-lint app/ -s high
 Requires PHP 8.1+ and Composer.
 
 ```bash
-git clone https://github.com/security-linter/php-laravel.git
+git clone https://opensource.rogarithm.net/rogarithm/php-security-linter.git
 cd php-laravel-security-linter
 composer install
 php bin/security-lint /path/to/target
@@ -267,7 +267,7 @@ jobs:
       - name: Run Security Linter
         run: |
           docker run --rm -v ${{ github.workspace }}:/target \
-            ghcr.io/security-linter/php-laravel:latest \
+            php-security-linter:latest \
             /target -s high -f sarif -o /target/security.sarif
 
       - name: Upload SARIF
@@ -280,7 +280,7 @@ jobs:
 
 ```yaml
 security-lint:
-  image: ghcr.io/security-linter/php-laravel:latest
+  image: php-security-linter:latest
   script:
     - security-lint . -s medium -f json -o security-report.json
   artifacts:
@@ -336,7 +336,7 @@ PHPやComposerの環境構築なしで使用できます。
 
 ```bash
 # リポジトリをクローン
-git clone https://github.com/security-linter/php-laravel.git
+git clone https://opensource.rogarithm.net/rogarithm/php-security-linter.git
 cd php-laravel-security-linter
 
 # インストール (Dockerイメージのビルドとコマンドのインストール)
@@ -357,7 +357,7 @@ php-security-lint app/ -s high
 PHP 8.1以上とComposerが必要です。
 
 ```bash
-git clone https://github.com/security-linter/php-laravel.git
+git clone https://opensource.rogarithm.net/rogarithm/php-security-linter.git
 cd php-laravel-security-linter
 composer install
 php bin/security-lint /path/to/target
@@ -575,7 +575,7 @@ jobs:
       - name: Run Security Linter
         run: |
           docker run --rm -v ${{ github.workspace }}:/target \
-            ghcr.io/security-linter/php-laravel:latest \
+            php-security-linter:latest \
             /target -s high -f sarif -o /target/security.sarif
 
       - name: Upload SARIF
@@ -588,7 +588,7 @@ jobs:
 
 ```yaml
 security-lint:
-  image: ghcr.io/security-linter/php-laravel:latest
+  image: php-security-linter:latest
   script:
     - security-lint . -s medium -f json -o security-report.json
   artifacts: