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.

webdrop_bridge.code-workspace

@@ -0,0 +1,53 @@
+{
+  "folders": [
+    {
+      "path": ".",
+      "name": "WebDrop Bridge"
+    }
+  ],
+  "settings": {
+    "python.defaultInterpreterPath": "${workspaceFolder}/venv/bin/python",
+    "python.linting.enabled": true,
+    "python.linting.pylintEnabled": false,
+    "python.linting.flake8Enabled": false,
+    "[python]": {
+      "editor.defaultFormatter": "ms-python.black-formatter",
+      "editor.formatOnSave": true,
+      "editor.codeActionsOnSave": {
+        "source.organizeImports": "explicit"
+      }
+    },
+    "python.testing.pytestEnabled": true,
+    "python.testing.pytestArgs": [
+      "tests"
+    ],
+    "files.exclude": {
+      "**/__pycache__": true,
+      "**/*.pyc": true,
+      "**/*.pyo": true,
+      ".pytest_cache": true,
+      ".tox": true,
+      "build": true,
+      "dist": true,
+      "*.egg-info": true
+    },
+    "search.exclude": {
+      "**/__pycache__": true,
+      ".venv": true,
+      "venv": true,
+      "build": true,
+      "dist": true
+    }
+  },
+  "extensions": {
+    "recommendations": [
+      "ms-python.python",
+      "ms-python.vscode-pylance",
+      "ms-python.black-formatter",
+      "charliermarsh.ruff",
+      "ms-python.debugpy",
+      "ms-python.flake8",
+      "ms-vscode.makefile-tools"
+    ]
+  }
+}