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/data/mod.rs

@@ -5,6 +5,7 @@ pub mod courses;
 pub mod models;
 pub mod reference;
 pub mod rmp;
+pub mod rmp_matching;
 pub mod scrape_jobs;
 pub mod sessions;
 pub mod users;