fix: remove remaining heredoc to resolve YAML syntax error

YAML SYNTAX FIX: Resolve line 227 could not find expected ':' error

Issues Fixed:
❌ yaml: line 227: could not find expected ':'
❌ Remaining heredoc causing YAML parsing issues
❌ Workflow config file invalid
❌ Heredoc content interpreted as YAML

Root Cause:
- Another heredoc in Python module creation
- Multi-line content being parsed as YAML
- YAML parser expecting key-value pairs
- Heredoc syntax incompatible with YAML structure

Solution Applied:
✅ Replaced heredoc with echo commands
✅ Line-by-line Python module creation
✅ Proper YAML syntax throughout
✅ Valid shell script commands

Implementation Changes:
- Removed heredoc syntax completely
- Used echo commands for each line
- Proper shell escaping for quotes
- Line-by-line file construction

Generated Content:
- Python docstring
- Version and author variables
- Proper Python module structure

Impact:
- YAML file now validates correctly
- Workflow config file is valid
- Python module creation works properly
- CI/CD execution without syntax errors
- Complete package structure generation

This resolves the final YAML syntax error that was preventing
the package tests workflow from being parsed correctly.

.gitea/workflows/package-tests.yml

@@ -223,12 +223,10 @@ jobs:
                     echo 'mypy = "^1.0.0"' >> "repo/packages/py/$pkg/pyproject.toml"
                     
                     # Create a simple Python module
-                    cat > "repo/packages/py/$pkg/src/$pkg/__init__.py" << 'EOF'
-"""Test package for CI."""
-
-__version__ = "0.1.0"
-__author__ = "AITBC Team"
-EOF
+                    echo '"""Test package for CI."""' > "repo/packages/py/$pkg/src/$pkg/__init__.py"
+                    echo '' >> "repo/packages/py/$pkg/src/$pkg/__init__.py"
+                    echo '__version__ = "0.1.0"' >> "repo/packages/py/$pkg/src/$pkg/__init__.py"
+                    echo '__author__ = "AITBC Team"' >> "repo/packages/py/$pkg/src/$pkg/__init__.py"
                   done
                   
                   cd repo