Raise report upload request size limits

- Configure NestJS with an explicit JSON and urlencoded body parser limit controlled by API_BODY_LIMIT.

- Set the default API body limit to 100mb for report HTML, key frames, template images, and Data URL file uploads.

- Add a matching Nginx client_max_body_size 100m limit so Docker web proxy no longer rejects large report saves first.

- Document the new request body limit in README, deployment docs, progress notes, environment example, and AGENTS context.

- Rebuild and verify Docker web/api with a large report save through the Nginx /api proxy.

docker-compose.yaml

@@ -20,6 +20,7 @@ services:
     restart: unless-stopped
     environment:
       API_PORT: 3100
+      API_BODY_LIMIT: 100mb
       CORS_ORIGIN: http://localhost:4002,http://localhost:3001
       DATABASE_URL: postgresql://surclaw:surclaw_dev_password@db:5432/surclaw?schema=public
       SESSION_SECRET: change-me-in-production