Add bio field and enhance smart assignment with bio matching

- Add bio field to User model for judge/mentor profile descriptions
- Add bio step to onboarding wizard (optional step with 500 char limit)
- Enhance smart assignment to match judge bio against project description
  - Uses keyword extraction and Jaccard-like similarity scoring
  - Only applies if judge has a bio (no penalty for empty bio)
  - Max 15 points for bio match on top of existing scoring
- Fix geographic distribution query to use round relation for programId
- Update score breakdown: tags (40), bio (15), workload (25), country (15)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/server/routers/user.ts

@@ -30,6 +30,7 @@ export const userRouter = router({
         metadataJson: true,
         phoneNumber: true,
         country: true,
+        bio: true,
         notificationPreference: true,
         profileImageKey: true,
         createdAt: true,
@@ -789,6 +790,7 @@ export const userRouter = router({
         name: z.string().min(1).max(255),
         phoneNumber: z.string().optional(),
         country: z.string().optional(),
+        bio: z.string().max(500).optional(),
         expertiseTags: z.array(z.string()).optional(),
         notificationPreference: z.enum(['EMAIL', 'WHATSAPP', 'BOTH', 'NONE']).optional(),
       })
@@ -811,6 +813,7 @@ export const userRouter = router({
           name: input.name,
           phoneNumber: input.phoneNumber,
           country: input.country,
+          bio: input.bio,
           expertiseTags: mergedTags,
           notificationPreference: input.notificationPreference || 'EMAIL',
           onboardingCompletedAt: new Date(),