Refactor config loading (in progress 3)

src/config/common.schema.ts

@@ -0,0 +1,14 @@
+import { z } from 'zod';
+
+/**
+ * Common/shared configuration options schema (now includes global options)
+ */
+export const CommonConfigSchema = z.object({
+	serviceName: z.string().default('llm-observability-mcp'),
+	serviceVersion: z.string().default('1.0.0'),
+	environment: z.string().default('development'),
+	debug: z.boolean().default(false),
+	logLevel: z.enum(['debug', 'info', 'warn', 'error']).default('info'),
+});
+
+export type CommonConfigType = z.infer<typeof CommonConfigSchema>;