chore: normalize line endings (CRLF -> LF)

No content changes: git diff --ignore-all-space over these files is empty.
The churn came from editing on Windows against a repo checked out with LF.

backend/.gitmodules

@@ -1,18 +1,18 @@
-[submodule "deepseek-ocr-2-demo-2026"]
-	path = deepseek-ocr-2-demo-2026
-	url = https://github.com/abdshomad/deepseek-ocr-2-demo-2026.git
-[submodule "LightOnOCR-2-1B-Demo-2026"]
-	path = LightOnOCR-2-1B-Demo-2026
-	url = https://github.com/abdshomad/LightOnOCR-2-1B-Demo-2026.git
-[submodule "nvidia-nemotron-ocr-v2-demo-2026"]
-	path = nvidia-nemotron-ocr-v2-demo-2026
-	url = https://github.com/abdshomad/nvidia-nemotron-ocr-v2-demo-2026.git
-[submodule "dots.ocr-demo-2026"]
-	path = dots.ocr-demo-2026
-	url = https://github.com/abdshomad/dots.ocr-demo-2026.git
-[submodule "glm-ocr-demo-2026"]
-	path = glm-ocr-demo-2026
-	url = https://github.com/abdshomad/glm-ocr-demo-2026.git
-[submodule "andrej-karpathy-skills"]
-	path = andrej-karpathy-skills
-	url = https://github.com/multica-ai/andrej-karpathy-skills.git
+[submodule "deepseek-ocr-2-demo-2026"]
+	path = deepseek-ocr-2-demo-2026
+	url = https://github.com/abdshomad/deepseek-ocr-2-demo-2026.git
+[submodule "LightOnOCR-2-1B-Demo-2026"]
+	path = LightOnOCR-2-1B-Demo-2026
+	url = https://github.com/abdshomad/LightOnOCR-2-1B-Demo-2026.git
+[submodule "nvidia-nemotron-ocr-v2-demo-2026"]
+	path = nvidia-nemotron-ocr-v2-demo-2026
+	url = https://github.com/abdshomad/nvidia-nemotron-ocr-v2-demo-2026.git
+[submodule "dots.ocr-demo-2026"]
+	path = dots.ocr-demo-2026
+	url = https://github.com/abdshomad/dots.ocr-demo-2026.git
+[submodule "glm-ocr-demo-2026"]
+	path = glm-ocr-demo-2026
+	url = https://github.com/abdshomad/glm-ocr-demo-2026.git
+[submodule "andrej-karpathy-skills"]
+	path = andrej-karpathy-skills
+	url = https://github.com/multica-ai/andrej-karpathy-skills.git