feat: create PARSER service skeleton with FastAPI

- Create parser-service/ with full structure
- Add FastAPI app with endpoints (/parse, /parse_qa, /parse_markdown, /parse_chunks)
- Add Pydantic schemas (ParsedDocument, ParsedBlock, ParsedChunk, etc.)
- Add runtime module with model_loader and inference (with dummy parser)
- Add configuration, Dockerfile, requirements.txt
- Update TODO-PARSER-RAG.md with completed tasks
- Ready for dots.ocr model integration

services/parser-service/app/runtime/__init__.py

@@ -0,0 +1,15 @@
+"""
+PARSER Runtime module
+Handles model loading and inference for dots.ocr
+"""
+
+from app.runtime.inference import parse_document, dummy_parse_document
+from app.runtime.model_loader import load_model, get_model
+
+__all__ = [
+    "parse_document",
+    "dummy_parse_document",
+    "load_model",
+    "get_model"
+]
+