feat: push deploy pipeline - auth, sidebar layout, ML artifacts, LFS

Notable changes:
- Add .gitattributes for LFS tracking on ML model artifacts
- Add AuthGuard to all protected routes + login/register/logout flow
- Add collapsible Sidebar replacing old Navbar
- Redesign MainLayout with sidebar + mobile header
- Add password show/hide toggle to AuthForm
- Add Logout button to MobileNav
- Update footer credit to ATLAS Project - Pijak x IBM SkillsBuild
- Update deploy.yml: generate ONNX in CI (vs HuggingFace download)
- Remove deprecated ML scripts (download/upload model .sh, .gitignore)
- Remove stale MEMORY.md
- Add ML model artifacts (TFLite, SavedModel, TFJS)
- Update notebook.ipynb training pipeline

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

Machine_Learning/model/tfjs_model/model.json

@@ -0,0 +1 @@
+{"format": "graph-model", "generatedBy": "2.19.0", "convertedBy": "TensorFlow.js Converter v4.22.0", "signature": {"inputs": {"inputs": {"name": "inputs:0", "dtype": "DT_FLOAT", "tensorShape": {"dim": [{"size": "-1"}, {"size": "224"}, {"size": "224"}, {"size": "3"}]}}}, "outputs": {"output_0": {"name": "Identity:0", "dtype": "DT_FLOAT", "tensorShape": {"dim": [{"size": "-1"}, {"size": "4"}]}}}}, "modelTopology": {"node": [{"name": "StatefulPartitionedCall/functional_6_1/batch_normalization_2_1/Line truncated