style: auto-fix ESLint issues (curly braces and formatting)

- Add curly braces to all if/else/for/while statements
- Fix indentation and trailing spaces
- Auto-fixed 372 linting errors using eslint --fix
- Remaining issues are warnings only (non-null assertions, explicit any types)

src/sandbox/docker.ts

@@ -81,7 +81,7 @@ export class DockerSandbox {
 
   /** Force-remove the container. */
   async destroy(): Promise<void> {
-    if (!this._containerId) return;
+    if (!this._containerId) {return;}
 
     try {
       await this.dockerCmd(['rm', '-f', this._containerId]);
@@ -98,8 +98,8 @@ export class DockerSandbox {
         execFile('docker', ['version', '--format', '{{.Server.Version}}'], {
           timeout: 5000,
         }, (error, stdout) => {
-          if (error) reject(error);
-          else resolve(stdout);
+          if (error) {reject(error);}
+          else {resolve(stdout);}
         });
       });
       return true;

src/sandbox/manager.ts

@@ -16,7 +16,7 @@ export class SandboxManager {
   /** Get or create a sandbox for a session. */
   async getOrCreate(sessionId: string): Promise<DockerSandbox> {
     let sandbox = this.sandboxes.get(sessionId);
-    if (sandbox) return sandbox;
+    if (sandbox) {return sandbox;}
 
     sandbox = new DockerSandbox({
       sessionId,
@@ -36,7 +36,7 @@ export class SandboxManager {
   /** Destroy a specific session's sandbox. */
   async destroy(sessionId: string): Promise<void> {
     const sandbox = this.sandboxes.get(sessionId);
-    if (!sandbox) return;
+    if (!sandbox) {return;}
 
     await sandbox.destroy();
     this.sandboxes.delete(sessionId);