Major refactoring: HTTP client unification and project restructuring

## HTTP Client Refactoring
- Create unified HttpClient module (src/http_client.rs)
- Refactor 24 files to use shared HTTP client
- Replace .unwrap() with proper error handling
- Eliminate code duplication in HTTP requests

## Project Restructuring
- Rename package: ai → aibot
- Add dual binary support: aibot (main) + ai (compatibility alias)
- Migrate config directory: ~/.config/ai/ → ~/.config/syui/ai/bot/
- Implement backward compatibility with automatic migration

## Testing Infrastructure
- Add unit tests for HttpClient
- Create test infrastructure with cargo-make
- Add test commands: test, test-quick, test-verbose

## Documentation
- Complete migration guide with step-by-step instructions
- Updated development guide with new structure
- HTTP client API reference documentation
- Comprehensive refactoring summary

## Files Changed
- Modified: 24 source files (HTTP client integration)
- Added: src/http_client.rs, src/alias.rs, src/tests/
- Added: 5 documentation files in docs/
- Added: migration setup script

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

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

scripts/setup-migration.sh

@@ -0,0 +1,37 @@
+#!/bin/bash
+# ai.bot 移行セットアップスクリプト
+
+echo "=== ai.bot Migration Setup ==="
+
+# 1. 新しい設定ディレクトリの作成
+echo "Creating new config directory..."
+mkdir -p ~/.config/syui/ai/bot/
+
+# 2. スクリプトディレクトリの移動（gitサブモジュール）
+if [ -d ~/.config/ai/scpt ]; then
+    echo "Copying script directory..."
+    cp -r ~/.config/ai/scpt ~/.config/syui/ai/bot/
+    echo "Scripts copied to ~/.config/syui/ai/bot/scpt/"
+fi
+
+# 3. 設定ファイルの移行（自動的にdata.rsで行われる）
+echo "Configuration files will be migrated automatically when used."
+
+# 4. エイリアス設定の提案
+echo ""
+echo "=== Manual Steps Required ==="
+echo ""
+echo "1. Add this alias to your shell profile (~/.zshrc, ~/.bashrc, etc.):"
+echo "   alias ai='aibot'"
+echo ""
+echo "2. Install the new binaries:"
+echo "   cargo install --path ."
+echo ""
+echo "3. Or add to PATH:"
+echo "   export PATH=\"$(pwd)/target/debug:\$PATH\""
+echo ""
+echo "4. Update git submodule path if needed:"
+echo "   cd ~/.config/syui/ai/bot/scpt"
+echo "   git remote -v  # Check current remote"
+echo ""
+echo "Migration setup complete!"