fix(tags): use parsePaginationParam to clamp popular-tags limit (#377)

Replaces ad-hoc Math.min/Math.max/parseInt with parsePaginationParam
so limit=0 clamps to 1, malformed values fall back to 50, and
oversized values cap at 200.

Fixes #360

Author: Nexu0ps

src/app/api/tags/popular/route.ts

@@ -1,3 +1,4 @@
+import { parsePaginationParam } from "@/lib/api-pagination";
 import { NextRequest, NextResponse } from "next/server";
 import { createClient } from "@/lib/supabase/server";
 import { parsePaginationParam } from "@/lib/api-pagination";