Add linter actions

.gitea/workflows/smart-clinic-compile-backend.yml

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+name: Compile Java Backend
+on:
+  pull_request:
+    paths:
+      - SmartClinicManagementSystem/**
+  push:
+    paths:
+      - SmartClinicManagementSystem/**
+jobs:
+  compile-backend:
+    runs-on: node20
+    name: Compile Backend Code
+    steps:
+      - uses: actions/checkout@v3
+      - name: Set up JDK
+        uses: actions/setup-java@v4
+        with:
+          distribution: 'temurin'
+          java-version: '21'
+      - name: Compile with Gradle
+        run: |
+          cd SmartClinicManagementSystem/app
+          ../../gradlew clean build

.gitea/workflows/smart-clinic-lint-backend.yml

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+name: Lint Java Backend
+on:
+  pull_request:
+    paths:
+      - SmartClinicManagementSystem/**
+  push:
+    paths:
+      - SmartClinicManagementSystem/**
+jobs:
+  lint-java:
+    runs-on: node20
+    name: Checkstyle Java Linting
+    steps:
+      - uses: actions/checkout@v3
+      - name: Set up JDK
+        uses: actions/setup-java@v4
+        with:
+          distribution: 'temurin'
+          java-version: '21'
+      - name: Download Checkstyle
+        run: curl -L -o checkstyle.jar https://github.com/checkstyle/checkstyle/releases/download/checkstyle-10.12.1/checkstyle-10.12.1-all.jar
+      - name: Run Checkstyle
+        run: |
+          java -jar checkstyle.jar -c /google_checks.xml app/src/main/java/com/project/back_end || true

.gitea/workflows/smart-clinic-lint-docker.yml

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+name: Lint Dockerfiles
+on:
+  pull_request:
+    paths:
+      - SmartClinicManagementSystem/**
+  push:
+    paths:
+      - SmartClinicManagementSystem/**
+jobs:
+  dockerlint:
+    runs-on: node20
+    name: Lint Dockerfiles
+    steps:
+      - uses: actions/checkout@v3
+      - name: Run hadolint
+        uses: hadolint/hadolint-action@v3.1.0
+        with:
+          dockerfile: ./SmartClinicManagementSystem/app/Dockerfile

.gitea/workflows/smart-clinic-lint-frontend.yml

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+name: Lint Frontend
+on:
+  pull_request:
+    paths:
+      - SmartClinicManagementSystem/**
+  push:
+    paths:
+      - SmartClinicManagementSystem/**
+jobs:
+  lint-frontend:
+    runs-on: node20
+    name: Lint HTML, CSS, and JS
+    steps:
+      - uses: actions/checkout@v3
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '18'
+      - name: Install linters
+        run: |
+          npm install -g htmlhint stylelint eslint
+      - name: Lint HTML
+        run: htmlhint SmartClinicManagementSystem/app/src/main/resources/static/assets/pages//*.html || true
+      - name: Lint CSS
+        run: stylelint "SmartClinicManagementSystem/app/src/main/resources/static/assets/css//*.css" || true
+      - name: Lint JS
+        run: eslint SmartClinicManagementSystem/app/src/main/resources/static/assets/js//*.js || true