Add VSCode workspace (#1941)

Related tiny-pilot/tinypilot-pro#1731

This PR adds a VSCode workspace file and moves all default `.vscode/*`
settings to `tinypilot.code-workspace`.

To make use of this new workspace, you need open VSCode via the
workspace file.
- Option 1: Using GUI
VSCode > FIle > Open Workspace from File... > `tinypilot.code-workspace`
- Option 2: Using terminal
    ```bash
    code ./tinypilot.code-workspace
    ```

Once the workspace is open, the VSCode file explorer should display a
single section:
<img width="370" height="317" alt="Screenshot 2026-02-09 at 14 47 40"
src="https://github.com/user-attachments/assets/aafe146d-c73f-4aed-a783-01bb14b77406"
/>

This PR also replaces some outdated settings keys, namely:
- `python.formatting.provider`
- `python.linting.pylintEnabled`
- `python.linting.enabled`
- `python.linting.lintOnSave`

These changes are needed to support multiple Python virtual environments
in Pro:
- tiny-pilot/tinypilot-pro#1755

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Author: jdeanwallace

.vscode/extensions.json

@@ -0,0 +1,30 @@
+{
+  "folders": [
+    {
+      "name": "TinyPilot App",
+      "path": "."
+    }
+  ],
+  "settings": {
+    "editor.defaultFormatter": "esbenp.prettier-vscode",
+    "editor.formatOnSave": true,
+    "[markdown]": {
+      "editor.formatOnSave": false
+    },
+    "[python]": {
+      "editor.defaultFormatter": "eeyore.yapf",
+      "editor.formatOnSave": true,
+      "editor.tabSize": 4
+    },
+    "python.defaultInterpreterPath": "${workspaceFolder}/venv/bin/python",
+    "pylint.enabled": true
+  },
+  "extensions": {
+    "recommendations": [
+      "charliermarsh.ruff",
+      "esbenp.prettier-vscode",
+      "ms-python.pylint",
+      "ms-python.python"
+    ]
+  }
+}