refactor!: simplify runtime coordination #7

Keep financial ownership, atomic publication and refresh CAS.
Failed refresh leaves cookies untouched; logout still clears them.

Remove full-history candle prefetch and special metadata retries.
Use native Pino request context instead of parallel middleware.

BREAKING CHANGE: remove investment stateVersion, queued sync state,
and tbank-sync status progress/resources. Consumers must observe
resources through sync=observe with the updated frontend contract.

src/common/logging/structured-logger.service.ts

@@ -1,8 +1,6 @@
 import { Injectable, OnApplicationShutdown } from '@nestjs/common';
 import { PinoLogger } from 'nestjs-pino';
 
-import { RequestContextService } from './request-context.service';
-
 type LogLevel = 'debug' | 'error' | 'info' | 'warn';
 type LogContext = Record<string, boolean | number | string | undefined>;
 
@@ -27,10 +25,7 @@ const allowedFields = new Set([
 
 @Injectable()
 export class StructuredLogger implements OnApplicationShutdown {
-  constructor(
-    private readonly requestContext: RequestContextService,
-    private readonly pino: PinoLogger,
-  ) {}
+  constructor(private readonly pino: PinoLogger) {}
 
   info(message: string, context?: LogContext): void {
     this.write('info', message, context);
@@ -51,7 +46,7 @@ export class StructuredLogger implements OnApplicationShutdown {
   ): void {
     // eslint-disable-next-line security/detect-object-injection -- The log level is restricted to the internal LogLevel union.
     this.pino[level](
-      this.safeContext({ ...this.requestContext.get(), ...context }),
+      this.safeContext(context),
       message,
     );
   }