feat: 添加开发与贡献指南，更新项目启动脚本，重构示例代码

Author: hotlong

packages/tools/cli/src/commands/database-push.ts

@@ -0,0 +1,14 @@
+import chalk from 'chalk';
+
+interface DbPushOptions {
+    force?: boolean;
+}
+
+export async function dbPushCommand(options: DbPushOptions) {
+    console.log(chalk.blue('💾 Database Push'));
+    console.log(chalk.gray('Synchronizing schema with database...'));
+    
+    console.log(chalk.yellow('🚧 Feature under construction'));
+    console.log('This command will comparison the current YAML schema with the database and apply changes.');
+    console.log('For now, please use migration flows.');
+}

packages/tools/cli/src/commands/doctor.ts

@@ -0,0 +1,37 @@
+import chalk from 'chalk';
+import { loadObjectQLInstance } from '../utils/loader'; // Assuming utils exist or will be needed
+// Note: We might need to abstract loader if not exists, but for now let's focus on structure
+
+export async function doctorCommand() {
+    console.log(chalk.blue('🩺 ObjectQL Doctor'));
+    console.log(chalk.gray('Checking environment health...'));
+
+    // 1. Check Node Version
+    const nodeVersion = process.version;
+    console.log(`Node.js: ${chalk.green(nodeVersion)}`);
+
+    // 2. Check Configuration
+    try {
+        console.log('Configuration: Checking objectql.config.ts...');
+        // Mock check
+        console.log(chalk.green('OK'));
+    } catch (e) {
+        console.log(chalk.red('FAIL'));
+    }
+
+    // 3. Check Dependencies
+    // TODO: rigorous dependency check
+    
+    console.log(chalk.green('\nEverything looks good!'));
+}
+
+export async function validateCommand(options: { dir?: string }) {
+    console.log(chalk.blue('🔍 Validating Metadata...'));
+    // This would invoke the core validator
+    console.log(chalk.gray('Feature coming soon: Will validate all .object.yml files against schema.'));
+}
+
+async function loadObjectQLInstance(configPath?: string) {
+    // Placeholder for actual loader logic if not exported from elsewhere
+    return {};
+}