feat(search): video facet

[dschmidt]

Stacked on #3198 (tika facets).

Draft: adds the video facet (dimensions, duration, codec, audio stream details) to the search index, the search API and the graph driveItem.

Maps what Apache Tika exposes for MP4/MOV today: width, height, duration, fourCC (video codec), audioSamplesPerSecond, audioChannels. Verified against the pinned Tika 4.0 snapshot with a real testVideoMp4.mp4.

Tika stores the video track dimensions under the same tiff:ImageWidth/tiff:ImageLength keys it uses for images (via Metadata.IMAGE_WIDTH), so image and video would otherwise both match. getImage is now gated on the image/ content type and getVideo on video/, inside the respective facet function, so a file gets exactly one of the two.

Still missing in Tika (left as TODOs in tika_video.go and the test):

• bitrate — Tika exposes no video bitrate; would need computing (media size / duration).
• frameRate — metadata-extractor's Mp4VideoDirectory has no frame-rate tag; would need computing from the sample-timing table.
• audioBitsPerSample — Mp4SoundDirectory.TAG_AUDIO_SAMPLE_SIZE exists but MP4Parser doesn't map it (easy to add upstream, like the audio:* keys).
• audioFormat — MP4Parser only sets xmpDM:audioCompressor for audio-typed files (and to the container major brand, not the codec), so it never fires for a video/* file. Needs tika to expose the audio track's codec.
• nice-to-have: a numeric audio channel count. Tika only emits the Mono/Stereo enum and drops >2 channels, so we map it heuristically; a raw count from Tika would be cleaner.

Needs a separate reva change, not includable here (same as the motion-photo PR): the WebDAV PROPFIND handler must know the video keys to expose the facet over WebDAV. It lives in vendored reva, so it needs its own reva PR + dependency bump. The required diff:

diff --git a/vendor/github.com/opencloud-eu/reva/v2/internal/http/services/owncloud/ocdav/propfind/propfind.go b/vendor/github.com/opencloud-eu/reva/v2/internal/http/services/owncloud/ocdav/propfind/propfind.go
index d86367a2c5..8e4af07848 100644
--- a/vendor/github.com/opencloud-eu/reva/v2/internal/http/services/owncloud/ocdav/propfind/propfind.go
+++ b/vendor/github.com/opencloud-eu/reva/v2/internal/http/services/owncloud/ocdav/propfind/propfind.go
@@ -107,6 +107,18 @@ var (
 		"orientation",
 		"takenDateTime",
 	}
+	videoKeys = []string{
+		"audioBitsPerSample",
+		"audioChannels",
+		"audioFormat",
+		"audioSamplesPerSecond",
+		"bitrate",
+		"duration",
+		"fourCC",
+		"frameRate",
+		"height",
+		"width",
+	}
 )
 
 type countingReader struct {
@@ -887,6 +899,8 @@ func metadataKeys(pf XML) ([]string, []string) {
 					metadataKeys = append(metadataKeys, metadataKeysWithPrefix("libre.graph.image", imageKeys)...)
 				case "http://owncloud.org/ns/photo":
 					metadataKeys = append(metadataKeys, metadataKeysWithPrefix("libre.graph.photo", photoKeys)...)
+				case "http://owncloud.org/ns/video":
+					metadataKeys = append(metadataKeys, metadataKeysWithPrefix("libre.graph.video", videoKeys)...)
 				default:
 					metadataKeys = append(metadataKeys, key)
 				}
@@ -944,7 +958,7 @@ func requiresExplicitFetching(n *xml.Name) bool {
 		}
 	case net.NsOwncloud:
 		switch n.Local {
-		case "favorite", "share-types", "checksums", "size", "tags", "audio", "location", "image", "photo":
+		case "favorite", "share-types", "checksums", "size", "tags", "audio", "location", "image", "photo", "video":
 			return true
 		default:
 			return false
@@ -1292,6 +1306,7 @@ func mdToPropResponse(ctx context.Context, pf *XML, md *provider.ResourceInfo, p
 			appendMetadataProp(k, "oc", "location", "libre.graph.location", locationKeys)
 			appendMetadataProp(k, "oc", "image", "libre.graph.image", imageKeys)
 			appendMetadataProp(k, "oc", "photo", "libre.graph.photo", photoKeys)
+			appendMetadataProp(k, "oc", "video", "libre.graph.video", videoKeys)
 		}
 
 		if md.Type == provider.ResourceType_RESOURCE_TYPE_CONTAINER {
@@ -1579,6 +1594,10 @@ func mdToPropResponse(ctx context.Context, pf *XML, md *provider.ResourceInfo, p
 					if k := md.GetArbitraryMetadata().GetMetadata(); k != nil {
 						appendMetadataProp(k, "oc", "photo", "libre.graph.photo", photoKeys)
 					}
+				case "video":
+					if k := md.GetArbitraryMetadata().GetMetadata(); k != nil {
+						appendMetadataProp(k, "oc", "video", "libre.graph.video", videoKeys)
+					}
 				case "name":
 					appendToOK(prop.Escaped("oc:name", md.Name))
 				case "shareid":

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