Update BookProgress model and schemas

Updated book progress model in anticipation of the KOReader sync
feature.

Renamed properties:
 - renamed "progress" to "percentage"
 - renamed "pdf_loc" to "pdf_page"
 - renamed "epub_loc" to "epub_cfi"

New properties:
 - "epub_xpointer", marks the location of an epub in KOReader
 - "device", the device type that updated the progress
 - "device_id", the id of the device that updated the progress

backend/src/chitai/database/models/book_progress.py

@@ -14,7 +14,11 @@ class BookProgress(BigIntAuditBase):
     book_id: Mapped[int] = mapped_column(
         ForeignKey("books.id", ondelete="cascade"), nullable=False
     )
-    epub_loc: Mapped[Optional[str]]
-    pdf_loc: Mapped[Optional[int]]
-    progress: Mapped[float]
+
+    epub_cfi: Mapped[Optional[str]]
+    epub_xpointer: Mapped[Optional[str]]
+    pdf_page: Mapped[Optional[int]]
+    percentage: Mapped[float]
     completed: Mapped[Optional[bool]]
+    device: Mapped[Optional[str]] # Device that updated the progress
+    device_id: Mapped[Optional[str]]

backend/src/chitai/schemas/book.py

@@ -161,14 +161,20 @@ class BookMetadataUpdate(BaseModel):
 
 
 class BookProgressCreate(BaseModel):
-    progress: float
-    epub_loc: str | None = None
-    pdf_loc: int | None = None
+    percentage: float
+    epub_cfi: str | None = None
+    epub_xpointer: str | None = None
+    pdf_page: int | None = None
     completed: bool | None = None
+    device_type: str | None = None
+    device_id: str | None = None
 
 
 class BookProgressRead(BaseModel):
-    progress: float
-    epub_loc: str | None = None
-    pdf_loc: int | None = None
+    percentage: float
+    epub_cfi: str | None = None
+    epub_xpointer: str | None = None
+    pdf_page: int | None = None
     completed: bool | None = False
+    device_type: str | None = None
+    device_id: str | None = None