Initial commit: CMM Report Analyzer

FastAPI app that parses CMM inspection reports (PDF/Excel/CSV),
computes SPC metrics (Cp/Cpk/Pp/Ppk, control limits, Shapiro-Wilk),
generates interactive Plotly charts, and provides AI-powered quality
summaries via Azure OpenAI with graceful fallback.

Includes 21 passing tests covering parsers, SPC calculations, and
API endpoints.

app/routers/upload.py

@@ -0,0 +1,46 @@
+from __future__ import annotations
+
+import tempfile
+from pathlib import Path
+
+from fastapi import APIRouter, HTTPException, UploadFile
+
+from app.config import settings
+from app.services.batch import process_batch
+
+router = APIRouter()
+
+ALLOWED_EXTENSIONS = {".pdf", ".xlsx", ".xls", ".csv"}
+
+
+@router.post("/upload")
+async def upload_files(files: list[UploadFile]):
+    if not files:
+        raise HTTPException(400, "No files provided")
+
+    saved: list[Path] = []
+    tmp_dir = Path(tempfile.mkdtemp(prefix="cmm_"))
+
+    for f in files:
+        if not f.filename:
+            continue
+        ext = Path(f.filename).suffix.lower()
+        if ext not in ALLOWED_EXTENSIONS:
+            raise HTTPException(
+                400, f"Unsupported file type: {ext}. Allowed: {ALLOWED_EXTENSIONS}"
+            )
+        size = 0
+        dest = tmp_dir / f.filename
+        with open(dest, "wb") as out:
+            while chunk := await f.read(1024 * 64):
+                size += len(chunk)
+                if size > settings.max_upload_mb * 1024 * 1024:
+                    raise HTTPException(400, f"File too large (max {settings.max_upload_mb} MB)")
+                out.write(chunk)
+        saved.append(dest)
+
+    if not saved:
+        raise HTTPException(400, "No valid files uploaded")
+
+    batch_id = await process_batch(saved)
+    return {"batch_id": batch_id, "file_count": len(saved)}