docs(home): 홈 추천 Phase 7 산출물을 정리한다

docs/20260529_메인_홈_추천_API/create-new-entity-tables.sql

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+create table recommendation_snapshot (
+    id bigint not null auto_increment,
+    created_at datetime(6) null,
+    updated_at datetime(6) null,
+    section_type varchar(50) not null,
+    target_id bigint not null,
+    score double not null,
+    snapshot_at datetime(6) not null,
+    random_tie_breaker double not null,
+    primary key (id),
+    index idx_recommendation_snapshot_latest (section_type, snapshot_at, score, random_tie_breaker),
+    index idx_recommendation_snapshot_target (section_type, target_id)
+);
+
+create table creator_content_view_history (
+    id bigint not null auto_increment,
+    created_at datetime(6) null,
+    updated_at datetime(6) null,
+    member_id bigint not null,
+    content_id bigint not null,
+    genre_id bigint not null,
+    viewed_at datetime(6) not null,
+    primary key (id),
+    index idx_creator_content_view_history_member_viewed (member_id, viewed_at),
+    index idx_creator_content_view_history_content (content_id),
+    index idx_creator_content_view_history_genre (genre_id)
+);