Document request size, timeout, and resource limits

[Subhransu-De]

What to build

Add production guidance for request body limits, server/proxy timeouts, worker memory, and resource sizing. A reusable template should make these limits explicit instead of relying on hidden defaults.

Acceptance criteria

• Docs define expected max request body size and upload behavior.
• Docs define server and reverse-proxy timeout expectations.
• Docs explain worker memory and concurrency considerations.
• If app-level limits are added, tests cover oversized or timed-out requests where practical.
• Deployment examples reflect the documented limits.

Blocked by

None - can start immediately.