fix: replace heredoc with echo commands to resolve YAML syntax error

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

Issues Fixed:
❌ yaml: line 206: could not find expected ':'
❌ Heredoc content interpreted as YAML
❌ Workflow config file invalid
❌ YAML validation failure

Root Cause:
- Heredoc content being parsed as YAML
- Multi-line content not properly escaped
- YAML parser expecting key-value pairs
- Heredoc syntax incompatible with YAML structure

Solution Applied:
✅ Replaced heredoc with echo commands
✅ Line-by-line file 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:
- [tool.poetry] section
- Package name, version, description
- Authors information
- Build system configuration
- Poetry core requirements

Impact:
- YAML file now validates correctly
- Workflow config file is valid
- Package generation works properly
- CI/CD execution without syntax errors
- Proper pyproject.toml creation

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

.gitea/workflows/package-tests.yml

@@ -202,17 +202,15 @@ jobs:
                   # Create minimal package directories for testing
                   for pkg in aitbc-core aitbc-crypto aitbc-sdk aitbc-agent-sdk; do
                     mkdir -p "repo/packages/py/$pkg"
-                    cat > "repo/packages/py/$pkg/pyproject.toml" << 'EOF'
-[tool.poetry]
-name = "$pkg"
-version = "0.1.0"
-description = "Test package for CI"
-authors = ["AITBC Team"]
-
-[build-system]
-requires = ["poetry-core"]
-build-backend = "poetry.core.masonry.api"
-EOF
+                    echo '[tool.poetry]' > "repo/packages/py/$pkg/pyproject.toml"
+                    echo "name = \"$pkg\"" >> "repo/packages/py/$pkg/pyproject.toml"
+                    echo 'version = "0.1.0"' >> "repo/packages/py/$pkg/pyproject.toml"
+                    echo 'description = "Test package for CI"' >> "repo/packages/py/$pkg/pyproject.toml"
+                    echo 'authors = ["AITBC Team"]' >> "repo/packages/py/$pkg/pyproject.toml"
+                    echo '' >> "repo/packages/py/$pkg/pyproject.toml"
+                    echo '[build-system]' >> "repo/packages/py/$pkg/pyproject.toml"
+                    echo 'requires = ["poetry-core"]' >> "repo/packages/py/$pkg/pyproject.toml"
+                    echo 'build-backend = "poetry.core.masonry.api"' >> "repo/packages/py/$pkg/pyproject.toml"
                   done
                   
                   cd repo