feat: add acoustic dedupe pipeline and docker runtime

am_deduper/arbitration.py

@@ -0,0 +1,26 @@
+from __future__ import annotations
+
+from pathlib import Path
+
+FORMAT_SCORE = {"flac": 100, "alac": 100, "wav": 100, "m4a": 60, "aac": 60, "ogg": 50, "opus": 50, "mp3": 40}
+
+def score(row) -> int:
+    value = FORMAT_SCORE.get((row["format"] or "").lower(), 0)
+    value += int((row["bitrate"] or 0) * 0.1)
+    if row["sample_rate"]:
+        value += min(int(row["sample_rate"] / 1000), 20)
+    if row["bit_depth"]:
+        value += min(int(row["bit_depth"]), 32)
+    return value
+
+def is_version_conflict(a, b) -> bool:
+    af = set((a["version_flags"] or "").split(","))
+    bf = set((b["version_flags"] or "").split(","))
+    return bool(af.symmetric_difference(bf))
+
+def choose_winner(rows):
+    def key(r):
+        path = str(r["file_path"])
+        admin = "/admin/" in path or path.endswith("/admin")
+        return (-score(r), 0 if admin else 1, r["created_at"], path)
+    return min(rows, key=key)