package: move code into src layout and add PyPI publish workflow

.github/workflows/publish.yml

@@ -0,0 +1,62 @@
+name: Publish
+
+on:
+  workflow_dispatch:
+  push:
+    tags:
+      - "v*"
+
+permissions:
+  contents: read
+  id-token: write
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.13"
+
+      - name: Set up uv
+        uses: astral-sh/setup-uv@v3
+
+      - name: Install project (frozen)
+        run: uv sync --frozen --no-editable
+
+      - name: Run tests
+        run: uv run python -m unittest discover -s tests
+
+      - name: Build distributions
+        run: uv build --no-sources
+
+      - name: Upload dist artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: dist
+          path: dist/**
+
+  publish:
+    needs: build
+    runs-on: ubuntu-latest
+    environment:
+      name: pypi
+      url: https://pypi.org/p/ctfd-mcp
+    permissions:
+      id-token: write
+      contents: read
+    steps:
+      - name: Download dist artifacts
+        uses: actions/download-artifact@v4
+        with:
+          name: dist
+          path: dist
+
+      - name: Publish to PyPI
+        uses: pypa/gh-action-pypi-publish@release/v1
+        with:
+          packages_dir: dist