feat: make all hardcoded limits configurable via env vars

- bodyLimit: conditional on MAX_UPLOAD_SIZE_MB (0 = 1GB practical max)
- rate limiting: disabled when RATE_LIMIT_PER_MIN=0
- shutdown timeout: 8s → 30s
- upload plugin: no fileSize/files cap when env=0
- session duration: configurable via SESSION_DURATION_HOURS (default 168h)
- login attempts: configurable via LOGIN_ATTEMPT_LIMIT
- batch/pipeline/svg-to-raster: skip guard when MAX_BATCH_SIZE=0
- pipeline steps: configurable via MAX_PIPELINE_STEPS (0 = unlimited)
- user-files: remove 200 hard cap
- stitch canvas: configurable via MAX_CANVAS_PIXELS (0 = unlimited)
- PDF pages: configurable via MAX_PDF_PAGES (0 = unlimited)
- SVG size: configurable via MAX_SVG_SIZE_MB (0 = unlimited)
- logo size: configurable via MAX_LOGO_SIZE_KB (default 2048)
- worker threads: auto-detect via resolveWorkerThreads (0 = auto)
- megapixels: skip validation when MAX_MEGAPIXELS=0
- seam carving: remove 1200px dimension cap
- concurrency: auto-detect via resolveConcurrency (0 = auto)

apps/api/src/routes/tools/svg-to-raster.ts

@@ -7,6 +7,7 @@ import PQueue from "p-queue";
 import sharp from "sharp";
 import { z } from "zod";
 import { env } from "../../config.js";
+import { resolveConcurrency } from "../../lib/env.js";
 import { formatZodErrors } from "../../lib/errors.js";
 import { sanitizeFilename } from "../../lib/filename.js";
 import { decodeHeic, encodeHeic } from "../../lib/heic-converter.js";
@@ -135,7 +136,7 @@ export function registerSvgToRaster(app: FastifyInstance) {
       return reply.status(400).send({ error: "No SVG files provided" });
     }
 
-    if (files.length > env.MAX_BATCH_SIZE) {
+    if (env.MAX_BATCH_SIZE > 0 && files.length > env.MAX_BATCH_SIZE) {
       return reply.status(400).send({
         error: `Too many files. Maximum batch size is ${env.MAX_BATCH_SIZE}`,
       });
@@ -157,7 +158,7 @@ export function registerSvgToRaster(app: FastifyInstance) {
     }
 
     const jobId = clientJobId || randomUUID();
-    const queue = new PQueue({ concurrency: env.CONCURRENT_JOBS });
+    const queue = new PQueue({ concurrency: resolveConcurrency(env) });
     const results: ({ buffer: Buffer; filename: string } | null)[] = new Array(files.length).fill(
       null,
     );