feat: 完善 signals 热度筛选与展示交互

prisma/schema.prisma

@@ -113,6 +113,8 @@ model Signal {
   tags        Json
   sections    Json
   engagement  Int      @default(0)
+  hotScore    Int      @default(0)
+  isHot       Boolean  @default(false)
   publishedAt DateTime
   isActive    Boolean  @default(true)
   createdAt   DateTime @default(now())
@@ -121,7 +123,9 @@ model Signal {
   @@unique([source, sourceUrl], map: "uniq_signal_source_url")
   @@index([source, publishedAt], map: "idx_signal_source_published")
   @@index([isActive, publishedAt], map: "idx_signal_active_published")
+  @@index([isActive, isHot, hotScore, publishedAt], map: "idx_signal_active_hot_sort")
   @@index([engagement], map: "idx_signal_engagement")
+  @@index([hotScore], map: "idx_signal_hot_score")
   @@map("signals")
 }