fix: Remove --skip-requirements to install full dependencies

- Remove --skip-requirements from cross-chain-sync and multi-chain-consensus tests
- Install full requirements.txt instead of individual packages
- Fixes cascading ModuleNotFoundError for sqlmodel and other dependencies
- aitbc_chain module requires many runtime dependencies

.gitea/workflows/cross-chain-tests.yml

@@ -49,8 +49,7 @@ jobs:
           bash scripts/ci/setup-python-venv.sh \
             --repo-dir "$PWD" \
             --venv-dir "$PWD/venv" \
-            --skip-requirements \
-            --extra-packages "pytest pytest-asyncio fastapi uvicorn httpx cryptography pydantic-settings"
+            --extra-packages "pytest pytest-asyncio"
           echo "✅ Python environment ready"
 
       - name: Test cross-chain block synchronization
@@ -199,8 +198,7 @@ jobs:
           bash scripts/ci/setup-python-venv.sh \
             --repo-dir "$PWD" \
             --venv-dir "$PWD/venv" \
-            --skip-requirements \
-            --extra-packages "pytest pytest-asyncio fastapi uvicorn httpx cryptography pydantic-settings"
+            --extra-packages "pytest pytest-asyncio"
           echo "✅ Python environment ready"
 
       - name: Test multi-chain consensus