v0.87.0 - sub-routers, middleware chains & binary streaming

Sub-routers grow up, middleware can be chained, and streaming handles binary + async data correctly.

✨ Features

• Modern SubRouter syntax with nested-prefix fixes and cleanups (#1404)
• Async authenticate() and automatic SubRouter auth-handler inheritance — sub-routers can configure their own auth or inherit the parent app's (#1407)
• Multiple middlewares per route (middleware chains) (#1405)
• Consolidated OpenAPI/Swagger fixes with per-route documentation flags (#1403)

🐛 Fixes

• StreamingResponse now supports bytes (binary downloads / application/octet-stream) and async DB access inside generators; generator errors now propagate to the logs instead of silently truncating the stream (#1412 — closes #1236, #1219)
• Cast bare before_request returns and handle OPTIONS under static mounts (#1409 — fixes #793, #1130)

📚 Docs

• Document catch-all / wildcard (*path) routes (#1410)

Full Changelog: v0.86.0...v0.87.0