refactor(probe): consolidate full probe() into MediaProber port

Add probe(video) -> MediaInfo | None to the MediaProber Protocol and
implement it on FfprobeMediaProber. The standalone
alfred/infrastructure/filesystem/ffprobe.py module is removed; all
callers (analyze_release / probe_media tools, testing scripts) now go
through the adapter.

Tests for the probe path moved to tests/infrastructure/test_ffprobe_prober.py
(patching subprocess.run at the adapter module level).

Unblocks the upcoming inspect_release orchestrator, which needs the
port — not a free function — to compose parse + main-video selection
+ probe in one shot.

testing/debug_release.py

@@ -88,13 +88,13 @@ def analyze(release_name: str, source_path: str | None = None) -> None:
         if not path.exists():
             print("  (chemin inexistant, probe skipped)")
         else:
-            from alfred.infrastructure.filesystem.ffprobe import probe
             from alfred.infrastructure.filesystem.find_video import find_video_file
+            from alfred.infrastructure.probe import FfprobeMediaProber
 
             video = find_video_file(path) if path.is_dir() else path
             if video:
                 print(f"  video file: {video.name}")
-                info = probe(video)
+                info = FfprobeMediaProber().probe(video)
                 if info:
                     print(f"  codec: {info.video_codec}")
                     print(f"  resolution: {info.resolution}")