Add GitHub workflows for PR validation and issue closure

.github/pull_request_template.md

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+## Description
+
+## Closes
+
+closes #

.github/workflows/close-issues-on-dev.yml

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+name: Close issues on dev merge
+
+on:
+  pull_request:
+    types: [closed]
+    branches: [dev]
+
+jobs:
+  close-issues:
+    if: github.event.pull_request.merged == true
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/github-script@v7
+        with:
+          script: |
+            const body = context.payload.pull_request.body || '';
+            const matches = [...body.matchAll(/(?:closes|fixes|resolves)\s+#(\d+)/gi)];
+
+            if (matches.length === 0) return;
+
+            for (const match of matches) {
+              const issueNumber = parseInt(match[1]);
+              await github.rest.issues.update({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                issue_number: issueNumber,
+                state: 'closed'
+              });
+              console.log(`Closed issue #${issueNumber}`);
+            }

.github/workflows/restrict-main-source.yml

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+name: Restrict merges to main
+
+on:
+  pull_request:
+    types: [opened, synchronize, reopened]
+    branches: [main]
+
+jobs:
+  check-source-branch:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/github-script@v7
+        with:
+          script: |
+            const source = context.payload.pull_request.head.ref;
+            if (source !== 'dev') {
+              core.setFailed(`❌ Les merges vers main sont uniquement autorisés depuis dev (branche source : ${source}).`);
+            }

.github/workflows/validate-pr.yml

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+name: Validate PR
+
+on:
+  pull_request:
+    types: [opened, edited, synchronize]
+    branches: [dev, main]
+
+jobs:
+  check-closes:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/github-script@v7
+        with:
+          script: |
+            const body = context.payload.pull_request.body || '';
+            const hasCloses = /(?:closes|fixes|resolves)\s+#\d+/i.test(body);
+            if (!hasCloses) {
+              core.setFailed('❌ Le body du PR doit contenir une référence "closes #XX".');
+            }