refactor: replace info-privacy(Python) with info-privacy-rs(Rust)

Switch submodule from Python info-privacy to the Rust rewrite
info-privacy-rs which provides:
- RKNN-accelerated OCR and face detection on RK3588
- REST API: /api/v1/analyze, /api/v1/redact (DOCX/PDF/XLSX)
- Better performance: regex + NER + image pipeline in a single binary

Rust service runs on port 8001 (already deployed on device).
Python service (port 8000) is no longer needed.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitmodules

@@ -1,9 +1,9 @@
-[submodule "deps/info-privacy"]
-	path = deps/info-privacy
-	url = http://edge-stack.synology.me:3000/qiurui/info-privacy.git
 [submodule "deps/embedding"]
 	path = deps/embedding
 	url = http://edge-stack.synology.me:3000/qiurui/embedding.git
 [submodule "deps/KVM"]
 	path = deps/KVM
 	url = http://edge-stack.synology.me:3000/qiurui/KVM.git
+[submodule "deps/info-privacy-rs"]
+	path = deps/info-privacy-rs
+	url = http://edge-stack.synology.me:3000/qiurui/info-privacy-rs.git