fix(security): harden API against pentest findings

- Default TRUST_PROXY=false to prevent XFF rate limit bypass (PT-01)
- Return 400 instead of 500 on malformed JSON input (PT-03)
- Default MAX_PIPELINE_STEPS=20 to prevent DoS (PT-04)
- Validate clientJobId length (max 128) across all routes (PT-06)
- Add security headers to all reply.hijack() streaming responses (PT-07)
- Sanitize usernames in audit log to prevent stored XSS (PT-08)
- Block TRACE method with 405 response (PT-10)
- Add 429 RateLimited response to OpenAPI spec (PT-12)
- Default MAX_SVG_SIZE_MB=50 to limit SVGZ decompression (PT-13)
- Pin Dockerfile base images by digest
- Sanitize OIDC IdP error and sub claim in audit log
- Sync Docker compose/Dockerfile defaults with env.ts

apps/api/src/routes/batch.ts

@@ -16,6 +16,7 @@ import PQueue from "p-queue";
 import sharp from "sharp";
 import { env } from "../config.js";
 import { autoOrient } from "../lib/auto-orient.js";
+import { getSecurityHeaders } from "../lib/csp.js";
 import { resolveConcurrency } from "../lib/env.js";
 import { formatZodErrors } from "../lib/errors.js";
 import { isToolInstalled } from "../lib/feature-status.js";
@@ -84,7 +85,10 @@ export async function registerBatchRoutes(app: FastifyInstance): Promise<void> {
           } else if (part.fieldname === "settings") {
             settingsRaw = part.value as string;
           } else if (part.fieldname === "clientJobId") {
-            clientJobId = part.value as string;
+            const raw = part.value as string;
+            if (typeof raw === "string" && raw.length > 0 && raw.length <= 128) {
+              clientJobId = raw;
+            }
           }
         }
       } catch (err) {
@@ -269,6 +273,7 @@ export async function registerBatchRoutes(app: FastifyInstance): Promise<void> {
         "Transfer-Encoding": "chunked",
         "X-Job-Id": jobId,
         "X-File-Results": encodeURIComponent(JSON.stringify(fileResultsMap)),
+        ...getSecurityHeaders(),
       });
 
       const archive = archiver("zip", { zlib: { level: 5 } });