feat(browser): add environment, credentials, and script logger to POST /exec

- ExecDto gains optional `environment` and `credentials` fields
- BrowserService.exec forwards both to CodeExecutorService.execute so
  helpers.env, helpers.getEnvUrl(), and helpers.getCredential() work
  identically to scenario-scheduler steps
- script console.log/warn/error now routed through TraceLogger with
  session label prefix
- integration tests cover env/creds injection and missing-alias error

server/src/browser/browser.service.ts

@@ -11,9 +11,10 @@ import { JSDOM } from "jsdom";
 import { SessionContextService } from "../session/session-context.service";
 import { SessionService } from "../session/session.service";
 import { CodeExecutorService } from "../code-executor/code-executor.service";
-import type { ExecResult } from "../code-executor/code-executor.service";
+import type { ExecResult, ScriptLogger } from "../code-executor/code-executor.service";
 import { SnippetService } from "../snippet/snippet.service";
 import type { Cookie } from "playwright";
+import type { EnvironmentData } from "../environment/environment.entity";
 
 export type { ExecResult } from "../code-executor/code-executor.service";
 
@@ -166,6 +167,8 @@ export class BrowserService {
     sessionName: string | undefined,
     code: string,
     url?: string,
+    environment?: EnvironmentData,
+    credentials?: Record<string, unknown>,
   ): Promise<ExecResult> {
     const label = sessionName ?? "anonymous";
 
@@ -182,14 +185,16 @@ export class BrowserService {
           await page.goto(url, { waitUntil: "networkidle" });
         }
         this.logger.log(`[${label}] exec: running user code`);
+        const scriptLogger: ScriptLogger = (level, msg) =>
+          this.logger[level](`[${label}] script: ${msg}`);
         const result = await this.codeExecutor.execute(
           page,
           context,
           code,
+          scriptLogger,
           undefined,
-          undefined,
-          undefined,
-          undefined,
+          credentials,
+          environment,
           snippets,
         );
         this.logger.log(`[${label}] exec: done`);
@@ -217,14 +222,16 @@ export class BrowserService {
       }
 
       this.logger.log(`[${label}] exec: running user code`);
+      const scriptLogger: ScriptLogger = (level, msg) =>
+        this.logger[level](`[${label}] script: ${msg}`);
       const result = await this.codeExecutor.execute(
         page,
         context,
         code,
+        scriptLogger,
         undefined,
-        undefined,
-        undefined,
-        undefined,
+        credentials,
+        environment,
         snippetMap,
       );
       this.logger.log(`[${label}] exec: done`);