feat: 우선순위 기반 1팀 1상 자동 적용

수상 결정 순서:
1. 실용성상(팜레스트, 최고가) → 1위 결정
2. 완성도상(양우산) → 1번 수상자 제외 후 1위
3. 재미상(손선풍기) → 1, 2번 수상자 제외 후 1위

발표(reveal) 순서는 그대로 손선풍기 → 양우산 → 팜레스트 (긴장감).

compute_winners() 헬퍼로 admin/ceremony 둘 다 동일 로직.
admin 분포 expander에 '상위상수상으로 제외' 마커.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

app.py

@@ -37,6 +37,10 @@ CATEGORIES = [
     ("utility_team", "🛠 실용성상", "팜레스트 5개"),
 ]
 
+# 수상 결정 우선순위 (높을수록 먼저 결정, 후순위 상에서 그 팀 제외)
+# 팜레스트(실용성) > 양우산(완성도) > 손선풍기(재미)
+PRIZE_PRIORITY = ["utility_team", "polish_team", "fun_team"]
+
 
 def get_conn():
     conn = sqlite3.connect(DB_PATH)
@@ -90,6 +94,36 @@ def fmt_team(team, titles):
     return f"{team} — {t}" if t else team
 
 
+def compute_winners():
+    """
+    우선순위 기반 1팀 1상 보장.
+    PRIZE_PRIORITY 순으로 결정, 이미 수상한 팀은 후순위 상에서 제외.
+    return: dict[col] = (winner_team, winner_votes, diff_with_2nd, all_rows_excluded)
+    """
+    conn = get_conn()
+    rankings = {}
+    for col, _, _ in CATEGORIES:
+        rankings[col] = conn.execute(
+            f"SELECT {col} AS team, COUNT(*) AS c FROM votes "
+            f"GROUP BY {col} ORDER BY c DESC, team ASC"
+        ).fetchall()
+    conn.close()
+
+    winners = {}
+    excluded = set()
+    for col in PRIZE_PRIORITY:
+        rows = rankings[col]
+        filtered = [(t, c) for t, c in rows if t not in excluded]
+        if not filtered:
+            winners[col] = None
+            continue
+        winner, votes = filtered[0]
+        runner = filtered[1][1] if len(filtered) > 1 else 0
+        winners[col] = (winner, votes, votes - runner, filtered)
+        excluded.add(winner)
+    return winners, rankings
+
+
 def render_voter():
     st.title("🗳 해커톤 투표")
     st.caption("이름 선택 → 본인 팀 자동 매핑 → 본인 팀 제외 3분야 투표. 한 번만 제출 가능.")
@@ -204,24 +238,29 @@ def render_admin():
             st.rerun()
 
     st.divider()
-    st.subheader("📊 분야별 집계")
+    st.subheader("📊 분야별 집계 (우선순위 적용 — 1팀 1상)")
+    st.caption(
+        "수상 결정 순서: 팜레스트(실용성) → 양우산(완성도) → 손선풍기(재미). "
+        "이미 받은 팀은 후순위 상에서 제외."
+    )
 
-    public_lines = []  # 시상식 발표용 (하위 비공개)
+    winners, rankings = compute_winners()
+    awarded_teams = {w[0] for w in winners.values() if w}
+    public_lines = []
 
-    for col, label, _ in CATEGORIES:
-        rows = conn.execute(
-            f"SELECT {col} AS team, COUNT(*) AS c FROM votes GROUP BY {col} ORDER BY c DESC, team ASC"
-        ).fetchall()
-
-        st.markdown(f"### {label}")
+    for col, label, prize in CATEGORIES:
+        rows = rankings[col]
+        st.markdown(f"### {label} ({prize})")
         if not rows:
             st.caption("표 없음")
             continue
 
-        winner_team, winner_votes = rows[0]
-        runner_votes = rows[1][1] if len(rows) > 1 else 0
-        diff = winner_votes - runner_votes
+        result = winners.get(col)
+        if not result:
+            st.warning("후보 없음 (모두 우선순위 상 수상)")
+            continue
 
+        winner_team, winner_votes, diff, _ = result
         winner_label = fmt_team(winner_team, titles)
         st.success(
             f"**우승: {winner_label}** — {winner_votes}표 (2위와 {diff}표 차이)"
@@ -230,9 +269,12 @@ def render_admin():
             f"- {label} 우승: **{winner_label}** ({winner_votes}표, 2위와 {diff}표 차이)"
         )
 
-        with st.expander("전체 분포 (진행자만)"):
+        with st.expander("전체 분포 — raw (제외 적용 전)"):
             for team, c in rows:
-                st.write(f"- {fmt_team(team, titles)}: {c}표")
+                marker = ""
+                if team in awarded_teams and team != winner_team:
+                    marker = " 🚫상위상수상으로 제외"
+                st.write(f"- {fmt_team(team, titles)}: {c}표{marker}")
 
     st.divider()
     st.subheader("🎤 시상식 발표용 (복사해서 화면 공유)")
@@ -256,19 +298,15 @@ def render_ceremony():
         return
 
     titles = get_titles()
-    conn = get_conn()
+    winners, _ = compute_winners()
 
+    # CATEGORIES 순서로 reveal (손선풍기 → 양우산 → 팜레스트)
     results = []
     for col, label, prize in CATEGORIES:
-        rows = conn.execute(
-            f"SELECT {col} AS team, COUNT(*) AS c FROM votes "
-            f"GROUP BY {col} ORDER BY c DESC, team ASC"
-        ).fetchall()
-        if rows:
-            winner, votes = rows[0]
-            runner = rows[1][1] if len(rows) > 1 else 0
-            results.append((label, prize, winner, votes, votes - runner))
-    conn.close()
+        result = winners.get(col)
+        if result:
+            winner, votes, diff, _ = result
+            results.append((label, prize, winner, votes, diff))
 
     if "ceremony_step" not in st.session_state:
         st.session_state.ceremony_step = 0