feat: add confidence-based RMP matching with manual review workflow

Replace simple auto-matching with scored candidate generation that
considers department overlap, name uniqueness, and rating volume.
Candidates above 0.85 auto-accept; others require admin approval.

src/web/mod.rs

@@ -1,6 +1,7 @@
 //! Web API module for the banner application.
 
 pub mod admin;
+pub mod admin_rmp;
 #[cfg(feature = "embed-assets")]
 pub mod assets;
 pub mod auth;