Add ffprobe binaries for video metadata probing

.gitignore

@@ -5,7 +5,7 @@
 .zed
 .history
 upload
-*.exe
+# *.exe  (uncomment if needed to exclude all .exe files)
 *.db
 build
 *.db-journal
@@ -34,6 +34,3 @@ redis_data/
 .gomodcache/
 .gocache-temp
 .gopath
-
-# ffprobe binaries (too large for git)
-service/ffprobe-bin/

service/ffprobe-bin/README.md

@@ -0,0 +1,17 @@
+Place platform ffprobe binaries here for embedded build mode.
+
+Expected files:
+
+- `windows-amd64/ffprobe.exe`
+- `linux-amd64/ffprobe`
+- `linux-arm64/ffprobe`
+
+Build with:
+
+`go build -tags embed_ffprobe .`
+
+If not using `embed_ffprobe`, the service falls back to:
+
+1. Side-by-side ffprobe file
+2. ffprobe from PATH
+3. HTTP range metadata parser