feat(mpp-idea): Integrate ToolchainFunctionProvider with mpp-core Tool system

[phodal]

Summary

Integrate IntelliJ IDEA's ToolchainFunctionProvider extension point with mpp-core's ToolOrchestrator and ToolRegistry system.

Background

Currently, mpp-idea has its own tool extension mechanism via ToolchainFunctionProvider (IntelliJ Extension Point), which includes:

• DatabaseFunctionProvider - Database schema and query tools
• KnowledgeFunctionProvider - API call chain analysis
• ComponentViewFunctionProvider - UI component analysis
• HistoryFunctionProvider - Code history analysis
• McpFunctionProvider - MCP integration

Meanwhile, mpp-core has a unified tool system with:

• Tool / ExecutableTool<TParams, TResult> interfaces
• ToolRegistry for tool management
• ToolProvider interface for tool discovery
• ToolOrchestrator for tool execution

Goal

Create an adapter layer to bridge these two systems, allowing IDEA-specific tools to be used by CodingAgent through the unified ToolOrchestrator.

Implementation Plan

1. ToolchainFunctionAdapter - Wraps ToolchainFunctionProvider as ExecutableTool
2. IdeaToolProvider - Implements ToolProvider to collect all ToolchainFunctionProvider extensions
3. Integration - Register IdeaToolProvider when creating CodingAgent in IDEA

Architecture

ToolchainFunctionProvider (IDEA Extension)
         ↓
ToolchainFunctionAdapter (wraps as ExecutableTool)
         ↓
IdeaToolProvider (implements ToolProvider)
         ↓
ToolProviderRegistry → ToolRegistry → ToolOrchestrator → CodingAgent

Files to Create/Modify

• mpp-idea/src/main/kotlin/cc/unitmesh/devins/idea/tool/ToolchainFunctionAdapter.kt
• mpp-idea/src/main/kotlin/cc/unitmesh/devins/idea/tool/IdeaToolProvider.kt
• Modify IdeaAgentViewModel.kt to register IDEA tools