Adapt Pinscope to DeepSeek, auto datasheets, and a shared library.

Based on manvalan/pinscope main. Default LLM is DeepSeek with local
skills and PDF ingest. Datasheets are fetched from LCSC/TI, stored in
the component library, and review extracts abs-max with a deeper
checklist. Adds scripts/update-pinscope.sh for the production host.

tests/test_library.py

@@ -0,0 +1,118 @@
+"""Shared component library: persist datasheets, catalog listing."""
+
+from __future__ import annotations
+
+from fastapi.testclient import TestClient
+
+from backend.services import projects as proj_svc
+from backend.services.datasheet_store import resolve_datasheet
+from backend.services.storage import LocalStorageBackend
+
+
+PDF = b"%PDF-1.4\n" + b"x" * 8000
+
+
+def _client(tmp_path) -> TestClient:
+    from backend.main import app
+
+    app.state.storage = LocalStorageBackend(tmp_path)
+    return TestClient(app)
+
+
+def test_save_datasheet_also_stores_in_library(storage):
+    meta = proj_svc.create_project(storage, "local", "board")
+    key = proj_svc.save_datasheet(storage, "local", meta.id, "CH340E", PDF)
+    assert key.endswith("CH340E.pdf")
+    assert storage.exists(key)
+    assert resolve_datasheet(storage, "CH340E")
+    assert proj_svc.library_has_datasheet(storage, "CH340E")
+
+
+def test_library_catalog_lists_ics_passives_and_pdfs(storage):
+    storage.write_json(
+        "library/extracted/CH340E.json",
+        {
+            "mpn": "CH340E",
+            "pintable": [{"pin": 1}, {"pin": 2}],
+            "component_subtype": "usb-uart",
+            "absolute_maximum_ratings": {"vcc": "5V"},
+        },
+    )
+    storage.write_json(
+        "library/patterns/samsung_c.json",
+        {
+            "name": "Samsung CL10",
+            "component_type": "capacitor",
+            "description": "Samsung 0603 MLCC",
+            "regex": r"^CL10",
+        },
+    )
+    storage.write_json(
+        "library/passives/CL10B474KA8NNNC.json",
+        {
+            "mpn": "CL10B474KA8NNNC",
+            "specs": {
+                "specs_type": "capacitor",
+                "component_subtype": "mlcc",
+                "values": {"capacitance": "470n"},
+            },
+        },
+    )
+    proj_svc.remember_datasheet(storage, "CH340E", PDF)
+
+    cat = proj_svc.list_library_catalog(storage)
+    assert len(cat["ics"]) == 1
+    assert cat["ics"][0]["mpn"] == "CH340E"
+    assert cat["ics"][0]["pin_count"] == 2
+    assert cat["ics"][0]["has_datasheet"] is True
+    assert cat["passives"][0]["mpn"] == "Samsung CL10"
+    assert cat["simple"][0]["mpn"] == "CL10B474KA8NNNC"
+    assert any(d["mpn"] == "CH340E" and d["has_extraction"] for d in cat["datasheets"])
+
+
+def test_library_http_catalog_and_pdf(tmp_path):
+    client = _client(tmp_path)
+    empty = client.get("/api/library")
+    assert empty.status_code == 200
+    body = empty.json()
+    assert body["ics"] == []
+    assert body["datasheets"] == []
+
+    meta = client.post("/api/projects", json={"name": "lib"}).json()
+    resp = client.post(
+        f"/api/projects/{meta['id']}/upload/datasheets",
+        params={"mpn": "MSPM0G3507"},
+        files={"file": ("msp.pdf", PDF, "application/pdf")},
+    )
+    assert resp.status_code == 200
+
+    catalog = client.get("/api/library").json()
+    assert any(d["mpn"] == "MSPM0G3507" for d in catalog["datasheets"])
+
+    pdf = client.get("/api/library/datasheet/MSPM0G3507")
+    assert pdf.status_code == 200
+    assert pdf.content.startswith(b"%PDF-")
+
+
+def test_fetch_datasheet_persists_to_library(tmp_path, monkeypatch):
+    from backend.services.datasheet_finder import DatasheetHit
+
+    async def fake_find(mpn, lcsc_id=None):
+        return DatasheetHit(
+            mpn,
+            pdf_bytes=PDF,
+            url="https://datasheet.lcsc.com/x.pdf",
+            source="lcsc",
+        )
+
+    monkeypatch.setattr(
+        "backend.services.datasheet_finder.find_datasheet", fake_find,
+    )
+    client = _client(tmp_path)
+    resp = client.get("/api/datasheets/fetch", params={"mpn": "CH340E"})
+    assert resp.status_code == 200
+    assert resp.content.startswith(b"%PDF-")
+
+    catalog = client.get("/api/library").json()
+    assert any(d["mpn"] == "CH340E" for d in catalog["datasheets"])
+    assert client.get("/api/library/datasheet/CH340E").status_code == 200