v1.3.3: 자체 최소 통계 및 스플래시 localStorage 정리

- 일별 익명 방문자 해시·사이트/게시물 통계(030 마이그레이션)
- POST /api/analytics/pageview, 관리자 analytics API, 클라이언트 트래커
- 관리자 대시보드 통계 카드·인기 게시물 Top 5
- 스플래시: SITE_BRAND_LOGO_TEXT localStorage 제거

db/migrations/030_analytics_daily_stats.sql

@@ -0,0 +1,35 @@
+CREATE TABLE IF NOT EXISTS site_analytics_daily (
+  day DATE PRIMARY KEY,
+  page_views INTEGER NOT NULL DEFAULT 0,
+  visitors INTEGER NOT NULL DEFAULT 0
+);
+
+CREATE TABLE IF NOT EXISTS post_analytics_daily (
+  day DATE NOT NULL,
+  post_id UUID NOT NULL REFERENCES posts(id) ON DELETE CASCADE,
+  views INTEGER NOT NULL DEFAULT 0,
+  reads INTEGER NOT NULL DEFAULT 0,
+  visitors INTEGER NOT NULL DEFAULT 0,
+  PRIMARY KEY (day, post_id)
+);
+
+CREATE INDEX IF NOT EXISTS post_analytics_daily_day_idx
+  ON post_analytics_daily (day DESC);
+
+CREATE TABLE IF NOT EXISTS analytics_daily_visitors (
+  id BIGSERIAL PRIMARY KEY,
+  day DATE NOT NULL,
+  scope TEXT NOT NULL,
+  post_id UUID REFERENCES posts(id) ON DELETE CASCADE,
+  visitor_hash TEXT NOT NULL,
+  created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+  CONSTRAINT analytics_daily_visitors_scope_check CHECK (scope IN ('site', 'post'))
+);
+
+CREATE UNIQUE INDEX IF NOT EXISTS analytics_daily_visitors_site_uidx
+  ON analytics_daily_visitors (day, visitor_hash)
+  WHERE scope = 'site';
+
+CREATE UNIQUE INDEX IF NOT EXISTS analytics_daily_visitors_post_uidx
+  ON analytics_daily_visitors (day, post_id, visitor_hash)
+  WHERE scope = 'post';