Make the component library a standalone product door (2.63.0).

Add /api/library datasheet import and component GET/PUT with no exam.
Reorganize pytest into datasheet, library, schematic, PCB, and AF+AI.
Document Rust criteria (none chosen; no rustup) and coding conformity.

tests/test_periscope_routers_rewrite.py

@@ -8,6 +8,7 @@ import backend.routers.admin as admin
 import backend.routers.contact as contact
 import backend.routers.deps as deps
 import backend.routers.feedback as feedback
+import backend.routers.library as library
 import backend.routers.pipeline as pipeline
 import backend.routers.projects as projects
 import backend.routers.reports as reports
@@ -27,6 +28,7 @@ def test_inherited_routers_are_src():
         (contact, "contact.py"),
         (deps, "deps.py"),
         (feedback, "feedback.py"),
+        (library, "library.py"),
         (pipeline, "pipeline.py"),
         (projects, "projects.py"),
         (reports, "reports.py"),