refactor: remove package-level caching to support dynamic installation

Remove package-level caching in cnr_utils and node_package modules to enable
proper dynamic custom node installation and version switching without ComfyUI
server restarts.

Key Changes:
- Remove @lru_cache decorators from version-sensitive functions
- Remove cached_property from NodePackage for dynamic state updates
- Add comprehensive test suite with parallel execution support
- Implement version switching tests (CNR ↔ Nightly)
- Add case sensitivity integration tests
- Improve error handling and logging

API Priority Rules (manager_core.py:1801):
- Enabled-Priority: Show only enabled version when both exist
- CNR-Priority: Show only CNR when both CNR and Nightly are disabled
- Prevents duplicate package entries in /v2/customnode/installed API
- Cross-match using cnr_id and aux_id for CNR ↔ Nightly detection

Test Infrastructure:
- 8 test files with 59 comprehensive test cases
- Parallel test execution across 5 isolated environments
- Automated test scripts with environment setup
- Configurable timeout (60 minutes default)
- Support for both master and dr-support-pip-cm branches

Bug Fixes:
- Fix COMFYUI_CUSTOM_NODES_PATH environment variable export
- Resolve test fixture regression with module-level variables
- Fix import timing issues in test configuration
- Register pytest integration marker to eliminate warnings
- Fix POSIX compliance in shell scripts (((var++)) → $((var + 1)))

Documentation:
- CNR_VERSION_MANAGEMENT_DESIGN.md v1.0 → v1.1 with API priority rules
- Add test guides and execution documentation (TESTING_PROMPT.md)
- Add security-enhanced installation guide
- Create CLI migration guides and references
- Document package version management

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

comfyui_manager/legacy/manager_core.py

@@ -41,12 +41,11 @@ from ..common.enums import NetworkMode, SecurityLevel, DBMode
 from ..common import context
 
 
-version_code = [4, 0, 3]
+version_code = [5, 0]
 version_str = f"V{version_code[0]}.{version_code[1]}" + (f'.{version_code[2]}' if len(version_code) > 2 else '')
 
 
 DEFAULT_CHANNEL = "https://raw.githubusercontent.com/Comfy-Org/ComfyUI-Manager/main"
-DEFAULT_CHANNEL_LEGACY = "https://raw.githubusercontent.com/ltdrdata/ComfyUI-Manager/main"
 
 
 default_custom_nodes_path = None
@@ -161,7 +160,7 @@ comfy_ui_revision = "Unknown"
 comfy_ui_commit_datetime = datetime(1900, 1, 1, 0, 0, 0)
 
 channel_dict = None
-valid_channels = {'default', 'local', DEFAULT_CHANNEL, DEFAULT_CHANNEL_LEGACY}
+valid_channels = {'default', 'local'}
 channel_list = None
 
 
@@ -1391,7 +1390,6 @@ class UnifiedManager:
                 return ManagedResult('skip')
             elif self.is_disabled(node_id):
                 return self.unified_enable(node_id)
-
             else:
                 version_spec = self.resolve_unspecified_version(node_id)