refactor(video-service): ♻️ Add video format enums and metadata models; refactor type definitions for consistency and type safety

Co-Authored-By: Lilith Autocommit <noreply@atlilith.com>

services/imajin-video/service/src/models/types.py

@@ -40,6 +40,18 @@ class JobStatusResponse(BaseModel):
     error: str | None = None
 
 
+class TranscodeRequest(BaseModel):
+    video_path: str = Field(..., description="Absolute path or HTTP(S) URL to the input video")
+    height: int = Field(480, description="Target height in pixels; width auto-calculated to preserve aspect ratio", ge=144, le=2160)
+    crf: int = Field(28, description="H.264 CRF quality 0–51 (lower = better/larger; default 28)", ge=0, le=51)
+    output_path: str | None = Field(None, description="Output file path; auto-derived as {stem}_sd.mp4 if omitted")
+
+
+class TranscodeResponse(BaseModel):
+    job_id: str
+    status: Literal["queued"] = "queued"
+
+
 @dataclass
 class FaceRegion:
     """Face detection result for a single face in a video frame.