Add GitHub Actions workflows

- sync-to-huggingface.yml: Auto-deploy to HF Spaces on push
- lint-and-test.yml: Code quality checks
- health-check.yml: Monitor deployed space hourly

.github/workflows/health-check.yml

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+# Health Check Workflow
+# Monitors the deployed Hugging Face Space
+name: Health Check
+
+on:
+  schedule:
+    # Run every hour
+    - cron: '0 * * * *'
+  workflow_dispatch:
+
+jobs:
+  health:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check HF Space Health
+        run: |
+          response=$(curl -s -o /dev/null -w "%{http_code}" https://mmrech-medsam2-server.hf.space/api/health || echo "000")
+          if [ "$response" = "200" ]; then
+            echo "✅ Space is healthy"
+            exit 0
+          else
+            echo "❌ Space health check failed (HTTP $response)"
+            exit 1
+          fi
+
+      - name: Notify on failure
+        if: failure()
+        uses: actions/github-script@v7
+        with:
+          script: |
+            github.rest.issues.create({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              title: '🚨 NeuroSeg Server Health Check Failed',
+              body: `Health check failed at ${new Date().toISOString()}\n\nPlease check the Hugging Face Space: https://mmrech-medsam2-server.hf.space`,
+              labels: ['bug', 'infrastructure']
+            })

.github/workflows/lint-and-test.yml

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+# Lint and Test Workflow
+name: Lint and Test
+
+on:
+  push:
+    branches: [main, develop]
+  pull_request:
+    branches: [main]
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.10'
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install flake8 black isort
+
+      - name: Lint with flake8
+        run: |
+          flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics || true
+
+      - name: Check formatting with black
+        run: |
+          black --check . || true
+
+      - name: Check imports with isort
+        run: |
+          isort --check-only . || true
+
+  test-syntax:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.10'
+
+      - name: Test Python syntax
+        run: |
+          python -m py_compile app.py
+          echo "✅ Python syntax OK"

.github/workflows/sync-to-huggingface.yml

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+# Sync NeuroSeg Server to Hugging Face Spaces
+# This workflow automatically deploys the server to Hugging Face Spaces when pushing to main
+name: Sync to Hugging Face Spaces
+
+on:
+  push:
+    branches: [main]
+  workflow_dispatch:
+
+jobs:
+  sync:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+          lfs: true
+
+      - name: Setup Git
+        run: |
+          git config user.name "GitHub Actions"
+          git config user.email "actions@github.com"
+
+      - name: Push to Hugging Face
+        env:
+          HF_TOKEN: ${{ secrets.HF_TOKEN }}
+        run: |
+          git remote add hf https://user:${HF_TOKEN}@huggingface.co/spaces/mmrech/medsam2-server
+          git push hf main --force