feat(shared): types API, logger structuré, validation env.ts

src/shared/lib/logger.ts

@@ -0,0 +1,18 @@
+type LogLevel = 'debug' | 'info' | 'warn' | 'error'
+type LogContext = Record<string, unknown>
+
+function log(level: LogLevel, message: string, context?: LogContext): void {
+  if (import.meta.env.DEV) {
+    console[level](`[${level.toUpperCase()}] ${message}`, context ?? '')
+    return
+  }
+  const entry = { level, message, timestamp: new Date().toISOString(), ...context }
+  console[level](JSON.stringify(entry))
+}
+
+export const logger = {
+  debug: (msg: string, ctx?: LogContext) => log('debug', msg, ctx),
+  info: (msg: string, ctx?: LogContext) => log('info', msg, ctx),
+  warn: (msg: string, ctx?: LogContext) => log('warn', msg, ctx),
+  error: (msg: string, ctx?: LogContext) => log('error', msg, ctx),
+}