initial structure implemented

docs -> _docs

models/chunks/__init__.py

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+from .sim3_transform import Sim3Transform
+from .chunk_handle import ChunkHandle
+from .chunk_bounds import ChunkBounds
+
+__all__ = [
+    "Sim3Transform",
+    "ChunkHandle",
+    "ChunkBounds",
+]
+

models/chunks/chunk_bounds.py

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+from pydantic import BaseModel
+from ..core.gps_point import GPSPoint
+
+
+class ChunkBounds(BaseModel):
+    estimated_center: GPSPoint
+    estimated_radius: float
+    confidence: float
+

models/chunks/chunk_handle.py

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+from typing import Optional
+from pydantic import BaseModel
+from ..core.gps_point import GPSPoint
+
+
+class ChunkHandle(BaseModel):
+    chunk_id: str
+    flight_id: str
+    start_frame_id: int
+    end_frame_id: Optional[int] = None
+    frames: list[int] = []
+    is_active: bool = True
+    has_anchor: bool = False
+    anchor_frame_id: Optional[int] = None
+    anchor_gps: Optional[GPSPoint] = None
+    matching_status: str = "unanchored"
+

models/chunks/sim3_transform.py

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+import numpy as np
+from pydantic import BaseModel, ConfigDict
+
+
+class Sim3Transform(BaseModel):
+    model_config = ConfigDict(arbitrary_types_allowed=True)
+
+    translation: np.ndarray
+    rotation: np.ndarray
+    scale: float
+