ci: add service host discovery and strict policy docs validation

- Add multi-candidate host discovery (localhost, host.docker.internal, gateway) in api-endpoint-tests
- Pass discovered service host via AITBC_API_HOST environment variable to test script
- Update test_api_endpoints.py to use AITBC_API_HOST for all service URLs
- Add validate-policies-strict job to docs-validation workflow for policy Markdown files
- Add job names to package-tests matrix for better CI output clarity
- Add --import

.gitea/workflows/package-tests.yml

@@ -17,6 +17,7 @@ concurrency:
 
 jobs:
   test-python-packages:
+    name: Python package - ${{ matrix.package.name }}
     runs-on: debian
     timeout-minutes: 15
 
@@ -101,6 +102,7 @@ jobs:
         run: rm -rf "/var/lib/aitbc-workspaces/pkg-${{ matrix.package.name }}"
 
   test-javascript-packages:
+    name: JavaScript package - ${{ matrix.package.name }}
     runs-on: debian
     timeout-minutes: 15