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Add Route Context Support

Add Route Context Support: a task in LegoFlow-SWE (Harbor dataset). Sanic should support a ctx prefix convention for passing arbitrary context values when registering routes. Currently, developers have no built-in way to annotate routes with metadata (like auth requirements, tags, or other custom…

The task

Sanic should support a `ctx_` prefix convention for passing arbitrary context values when registering routes. Currently, developers have no built-in way to annotate routes with metadata (like auth requirements, tags, or other custom properties) that can be accessed later in middlewares or handlers.

Part of Lego-X/LegoFlow-SWE.