Phase 3 implementation. Coordinate system implemented. Initial text box tool implemented.

backend/app/schemas/annotations.py

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+from datetime import datetime
+from typing import Literal, Union, List, Tuple, Optional
+from pydantic import BaseModel, Field
+from uuid import UUID
+
+class Rect(BaseModel):
+    x: float
+    y: float
+    width: float
+    height: float
+
+class AnnotationBase(BaseModel):
+    id: UUID
+    page: int = Field(ge=0)
+    type: str
+    rect: Rect
+    rotation: float = 0.0
+    z: int = 0
+    createdAt: datetime
+    updatedAt: datetime
+
+class TextProps(BaseModel):
+    text: str
+    fontFamily: str = "Liberation Sans"
+    fontSize: float = 14
+    color: str = "#000000"
+    align: Literal["left", "center", "right"] = "left"
+    bold: bool = False
+    italic: bool = False
+    lineHeight: float = 1.2
+    highlightColor: Optional[str] = None
+
+class TextAnnotation(AnnotationBase):
+    type: Literal["text"]
+    props: TextProps
+
+class DrawProps(BaseModel):
+    paths: List[Tuple[float, float]]
+    strokeColor: str = "#000000"
+    strokeWidth: float = 2
+    opacity: float = 1.0
+
+class DrawAnnotation(AnnotationBase):
+    type: Literal["draw"]
+    props: DrawProps
+
+class SignatureDrawProps(BaseModel):
+    mode: Literal["draw"]
+    ref: str
+    strokeColor: str = "#000000"
+
+class SignatureTypeProps(BaseModel):
+    mode: Literal["type"]
+    text: str
+    fontFamily: str
+    color: str = "#000000"
+
+class SignatureAnnotation(AnnotationBase):
+    type: Literal["signature"]
+    props: Union[SignatureDrawProps, SignatureTypeProps] = Field(discriminator="mode")
+
+class ImageProps(BaseModel):
+    ref: str
+    naturalWidth: float
+    naturalHeight: float
+
+class ImageAnnotation(AnnotationBase):
+    type: Literal["image"]
+    props: ImageProps
+
+class HighlightProps(BaseModel):
+    color: str = "#FFEB3B"
+    opacity: float = 0.3
+
+class HighlightAnnotation(AnnotationBase):
+    type: Literal["highlight"]
+    props: HighlightProps
+
+class ShapeProps(BaseModel):
+    kind: Literal["rect", "ellipse", "line", "arrow"]
+    strokeColor: str = "#000000"
+    fillColor: str = "transparent"
+    strokeWidth: float = 2
+
+class ShapeAnnotation(AnnotationBase):
+    type: Literal["shape"]
+    props: ShapeProps
+
+Annotation = Union[
+    TextAnnotation,
+    DrawAnnotation,
+    SignatureAnnotation,
+    ImageAnnotation,
+    HighlightAnnotation,
+    ShapeAnnotation
+]
+
+class AnnotationStateResponse(BaseModel):
+    data: List[Annotation]
+    updatedAt: datetime
+
+class AnnotationStateUpdateRequest(BaseModel):
+    data: List[Annotation]
+    baseUpdatedAt: datetime | None = None
+
+class AnnotationStateUpdateResponse(BaseModel):
+    updatedAt: datetime