feat(video): add video upload with remux/transcode playback

Add video as a media kind in photos: streaming upload with per-kind
limits, ffprobe metadata, poster frame reusing the image variant
pipeline, and a playback object (remux when web-compatible, else
h264/yuv420p/aac transcode). Video jobs run on a separate pool with a
long lease. Frontend gains a video viewer, grid badge/duration and
video upload.

backend/internal/photos/handlers.go

@@ -2,7 +2,6 @@ package photos
 
 import (
 	"errors"
-	"io"
 	"net/http"
 	"strconv"
 	"time"
@@ -13,8 +12,6 @@ import (
 	"galo/internal/httpx"
 )
 
-const maxUploadSize = 100 << 20
-
 type Handler struct {
 	svc *Service
 }
@@ -41,12 +38,12 @@ func (h *Handler) List(c *gin.Context) {
 }
 
 func (h *Handler) Upload(c *gin.Context) {
-	c.Request.Body = http.MaxBytesReader(c.Writer, c.Request.Body, maxUploadSize)
+	c.Request.Body = http.MaxBytesReader(c.Writer, c.Request.Body, h.svc.MaxUploadSize())
 	form, err := c.MultipartForm()
 	if err != nil {
 		var maxErr *http.MaxBytesError
 		if errors.As(err, &maxErr) {
-			httpx.RespondError(c, httpx.NewError(http.StatusRequestEntityTooLarge, "file_too_large", "files exceed the maximum upload size (100 MB)"))
+			httpx.RespondError(c, httpx.NewError(http.StatusRequestEntityTooLarge, "file_too_large", "files exceed the maximum upload size"))
 			return
 		}
 		httpx.RespondError(c, httpx.BadRequest("invalid_request", "invalid multipart form"))
@@ -68,19 +65,15 @@ func (h *Handler) Upload(c *gin.Context) {
 			httpx.RespondError(c, err)
 			return
 		}
-		data, err := io.ReadAll(io.LimitReader(f, maxUploadSize))
-		f.Close()
-		if err != nil {
-			httpx.RespondError(c, err)
-			return
-		}
 		p, err := h.svc.Upload(c.Request.Context(), UploadInput{
 			AlbumID:  c.Param("id"),
 			UserID:   auth.UserID(c),
 			Filename: fh.Filename,
 			MimeType: fh.Header.Get("Content-Type"),
-			Data:     data,
+			Reader:   f,
+			Size:     fh.Size,
 		})
+		f.Close()
 		if err != nil {
 			httpx.RespondError(c, err)
 			return