feat: Implement core application structure, AI extraction, persistence, and Telegram bot modules with updated configuration and dependencies.

app/ingestion/document.py

@@ -0,0 +1,31 @@
+"""
+Handles processing of document inputs (e.g., PDFs, Word docs).
+"""
+import logging
+
+logger = logging.getLogger(__name__)
+
+def process_document_input(doc_data: bytes) -> str:
+    """
+    Placeholder for document input processing.
+    This will eventually involve text extraction from files like PDFs.
+
+    Args:
+        doc_data: The raw bytes of the document file.
+
+    Returns:
+        The extracted text, or an empty string if failed.
+    """
+    logger.info("Processing document input (stub).")
+    # In a real implementation, you would use a library like PyMuPDF for PDFs.
+    # For example:
+    # try:
+    #     import fitz  # PyMuPDF
+    #     with fitz.open(stream=doc_data, filetype="pdf") as doc:
+    #         text = "".join(page.get_text() for page in doc)
+    #     return text
+    # except Exception as e:
+    #     logger.error(f"PDF processing failed: {e}")
+    #     return ""
+
+    return "Sample text extracted from PDF document."