Add initial project structure and documentation

- Created architecture documentation outlining high-level design, module organization, data flow, security model, performance considerations, testing strategy, and deployment architecture.
- Added pyproject.toml for project metadata and dependencies management.
- Introduced requirements files for development and production dependencies.
- Set up testing configuration with pytest and tox.
- Established basic directory structure for source code and tests, including __init__.py files.
- Implemented a sample web application (index.html) for drag-and-drop functionality.
- Configured VS Code workspace settings for Python development.

.env.example

@@ -0,0 +1,26 @@
+# WebDrop Bridge Configuration
+
+# Application
+APP_NAME=WebDrop Bridge
+APP_VERSION=1.0.0
+APP_ENV=development
+
+# Web App
+WEBAPP_URL=file:///./webapp/index.html
+# WEBAPP_URL=http://localhost:3000  # For development
+
+# Logging
+LOG_LEVEL=DEBUG
+LOG_FILE=logs/webdrop_bridge.log
+
+# Security - Path Whitelist
+ALLOWED_ROOTS=Z:/,C:/Users/Public
+
+# UI
+WINDOW_WIDTH=1024
+WINDOW_HEIGHT=768
+WINDOW_TITLE=WebDrop Bridge
+
+# Feature Flags
+ENABLE_DRAG_LOGGING=true
+ENABLE_PROFILING=false