refactor: replace all explicit any types with proper TypeScript types

Backend resolvers: typed enrichArticle/enrichVideo/enrichModel with DB
and $inferSelect types, SQL<unknown>[] for conditions arrays, proper
enum casts for status/role fields, $inferInsert for .set() updates,
typed raw SQL result rows in gamification, ReplyLike interface for
ctx.reply in auth. Frontend: typed catch blocks with Error/interface
casts, isActiveLink param, adminGetUser response, tags filter callback.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

packages/backend/src/graphql/resolvers/gamification.ts

@@ -37,7 +37,7 @@ builder.queryField("leaderboard", (t) =>
         .limit(limit)
         .offset(offset);
 
-      return entries.map((e: any, i: number) => ({ ...e, rank: offset + i + 1 }));
+      return entries.map((e, i) => ({ ...e, rank: offset + i + 1 }));
     },
   }),
 );
@@ -101,7 +101,7 @@ builder.queryField("userGamification", (t) =>
 
       return {
         stats: stats[0] ? { ...stats[0], rank } : null,
-        achievements: userAchievements.map((a: any) => ({
+        achievements: userAchievements.map((a) => ({
           ...a,
           date_unlocked: a.date_unlocked!,
         })),