feat: integrate upload-platform v0.2.2 into drhider (v0.0.78)

- Update upload/ module to v0.2.2 with modular Layer 1 (FilePicker) and Layer 2 (Streaming transit upload)
- Replace legacy manual file table in site/templates/index.html with FilePicker.initFilePicker
- Wire uploadViaVM with per-file status updates and abort signal support
- Add dist bundles to dist/ and site/static/dist/ with routes in site/routes/main_bp.py
- Add test_hardening.py and test_safe_name.py from upload-platform
- Bump version to 0.0.78 in site/app.py
- Document integration plan and report in History/upload-integration/

upload/config.example.json

@@ -1,13 +1,3 @@
 {
-  "vmUploadUrl": "https://contracts.kube5s.ru/drhider-upload/",
-  "allowedExt": [".pdf", ".doc", ".docx", ".txt", ".md"],
-  "maxFileBytes": 52428800,
-  "maxSessionBytes": 524288000,
-  "apiPrefix": "/api",
-  "vmUploadPrefix": "https://contracts.kube5s.ru/drhider-upload/",
-  "pullRetries": 3,
-  "pullRetryDelay": 2,
-  "pullTimeout": 120,
-  "ttlSeconds": 1800,
-  "estMbSec": 12
-}
+  "allowedExt": [".pdf", ".doc", ".docx", ".txt", ".md"]
+}