feat: add decorator registration for new MCP host configs

Update module initialization to expose new MCP host configuration
components and trigger automatic decorator-based strategy registration.

Changes:
- Import and expose MCPServerConfig, MCPHostType, and core models
- Import and expose MCPHostRegistry and MCPHostConfigurationManager
- Import strategies module to trigger @register_host_strategy decorators
- Provide comprehensive public API for MCP host configuration functionality

The import of strategies module ensures all host strategies are automatically
registered with the MCPHostRegistry when the package is imported, following
the established decorator pattern for automatic component discovery.

Author: LittleCoinCoin

hatch/mcp_host_config/__init__.py

@@ -1,5 +1,25 @@
 """MCP (Model Context Protocol) support for Hatch.
 
 This module provides MCP host configuration management functionality,
-including backup and restore capabilities for MCP server configurations.
+including backup and restore capabilities for MCP server configurations,
+decorator-based strategy registration, and consolidated Pydantic models.
 """
+
+from .backup import MCPHostConfigBackupManager
+from .models import (
+    MCPHostType, MCPServerConfig, HostConfiguration, EnvironmentData,
+    PackageHostConfiguration, EnvironmentPackageEntry, ConfigurationResult, SyncResult
+)
+from .host_management import (
+    MCPHostRegistry, MCPHostStrategy, MCPHostConfigurationManager, register_host_strategy
+)
+
+# Import strategies to trigger decorator registration
+from . import strategies
+
+__all__ = [
+    'MCPHostConfigBackupManager',
+    'MCPHostType', 'MCPServerConfig', 'HostConfiguration', 'EnvironmentData',
+    'PackageHostConfiguration', 'EnvironmentPackageEntry', 'ConfigurationResult', 'SyncResult',
+    'MCPHostRegistry', 'MCPHostStrategy', 'MCPHostConfigurationManager', 'register_host_strategy'
+]