fix: add missing S3_FORCE_PATH_STYLE environment variable

The S3 module was referencing config.forcePathStyle but the value
was never being read from the environment. This adds the missing
forcePathStyle configuration to the S3 config.

Closes #940

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

packages/server/src/common/config/s3.ts

@@ -6,4 +6,5 @@ export default registerAs('s3', () => ({
   secretAccessKey: process.env.S3_SECRET_ACCESS_KEY,
   endpoint: process.env.S3_ENDPOINT,
   bucket: process.env.S3_BUCKET,
+  forcePathStyle: process.env.S3_FORCE_PATH_STYLE === 'true',
 }));