feat: add rmp profile links and confidence-aware rating display

src/data/courses.rs

@@ -148,7 +148,7 @@ pub async fn get_course_instructors(
     let rows = sqlx::query_as::<_, CourseInstructorDetail>(
         r#"
         SELECT i.banner_id, i.display_name, i.email, ci.is_primary,
-               rp.avg_rating, rp.num_ratings,
+               rp.avg_rating, rp.num_ratings, i.rmp_legacy_id,
                ci.course_id
         FROM course_instructors ci
         JOIN instructors i ON i.banner_id = ci.instructor_id
@@ -177,7 +177,7 @@ pub async fn get_instructors_for_courses(
     let rows = sqlx::query_as::<_, CourseInstructorDetail>(
         r#"
         SELECT i.banner_id, i.display_name, i.email, ci.is_primary,
-               rp.avg_rating, rp.num_ratings,
+               rp.avg_rating, rp.num_ratings, i.rmp_legacy_id,
                ci.course_id
         FROM course_instructors ci
         JOIN instructors i ON i.banner_id = ci.instructor_id

src/data/models.rs

@@ -85,6 +85,7 @@ pub struct CourseInstructorDetail {
     pub is_primary: bool,
     pub avg_rating: Option<f32>,
     pub num_ratings: Option<i32>,
+    pub rmp_legacy_id: Option<i32>,
     /// Present when fetched via batch query; `None` for single-course queries.
     pub course_id: Option<i32>,
 }

src/web/routes.rs

@@ -439,6 +439,7 @@ pub struct InstructorResponse {
     is_primary: bool,
     rmp_rating: Option<f32>,
     rmp_num_ratings: Option<i32>,
+    rmp_legacy_id: Option<i32>,
 }
 
 #[derive(Serialize, TS)]
@@ -473,6 +474,7 @@ fn build_course_response(
             is_primary: i.is_primary,
             rmp_rating: i.avg_rating,
             rmp_num_ratings: i.num_ratings,
+            rmp_legacy_id: i.rmp_legacy_id,
         })
         .collect();