[Partner Nodes] feat(sync.so): add support for "sync-3" model (#14928)

Signed-off-by: bigcat88 <bigcat88@icloud.com>

comfy_api_nodes/apis/sync_so.py

@@ -0,0 +1,49 @@
+from pydantic import BaseModel, Field
+
+
+class SyncInputItem(BaseModel):
+    type: str = Field(..., description="Input kind: 'video', 'image' or 'audio'.")
+    url: str = Field(...)
+
+
+class SyncActiveSpeakerDetection(BaseModel):
+    auto_detect: bool | None = Field(
+        None, description="Detect the active speaker automatically. Video input only; rejected for images."
+    )
+    frame_number: int | None = Field(
+        None, description="Frame used for manual speaker selection. Must be 0 for image inputs."
+    )
+    coordinates: list[int] | None = Field(
+        None, description="Pixel [x, y] of the speaker's face in the frame selected by frame_number."
+    )
+
+
+class SyncGenerationOptions(BaseModel):
+    sync_mode: str | None = Field(
+        None,
+        description="How to resolve an audio/video duration mismatch: "
+        "cut_off, bounce, loop, silence or remap. Ignored for image inputs.",
+    )
+    i2v_prompt: str | None = Field(
+        None, description="Motion prompt for image-to-video generation. Image input only."
+    )
+    active_speaker_detection: SyncActiveSpeakerDetection | None = Field(None)
+
+
+class SyncGenerationRequest(BaseModel):
+    model: str = Field(..., description="Generation model, e.g. 'sync-3'.")
+    input: list[SyncInputItem] = Field(
+        ..., description="Exactly one visual input (video or image) plus one audio input."
+    )
+    options: SyncGenerationOptions | None = Field(None)
+
+
+class SyncGeneration(BaseModel):
+    """Subset of the Generation object returned by POST /v2/generate and GET /v2/generate/{id}."""
+
+    id: str = Field(...)
+    status: str = Field(..., description="PENDING | PROCESSING | COMPLETED | FAILED | REJECTED")
+    outputUrl: str | None = Field(None)
+    outputDuration: float | None = Field(None)
+    error: str | None = Field(None, description="Human-readable failure message.")
+    errorCode: str | None = Field(None, description="Stable machine-readable code from the GET /v2/errors catalog.")