chore: create Cursor rules (#2273)

* chore: create Cursor rules
* chore: have `.cursor` be ignored in essential GitHub workflow files

.cursor/rules/general.mdc

@@ -0,0 +1,33 @@
+---
+description: 
+globs: 
+alwaysApply: true
+---
+# General
+
+- Anthias uses Django as the web framework
+
+# Project Structure
+
+- [anthias_app](mdc:anthias_app) and [anthias_django](mdc:anthias_django) is where the Django source code lives.
+- Django HTML templates live in the [templates](mdc:templates) directory.
+- The [static](mdc:static) directory contains static files like HTML, CSS, and JavaScript
+  files used for the web interface.
+  - The source code was written in CoffeeScript, which gets transpiled to JavaScript.
+- The [webpack.common.js](mdc:webpack.common.js), [webpack.dev.js](mdc:webpack.dev.js), and [webpack.prod.js](mdc:webpack.prod.js) are configuration files
+  necessary for transpiling CoffeeScript and SCSS source files to JavaScript and CSS files,
+  respectively.
+- This project uses Docker for containerization.
+  - [docker-compose.yml.tmpl](mdc:docker-compose.yml.tmpl) is used for instances installed on Raspberry Pi and x86 devices
+    that runs Raspberry Pi OS Lite or Debian.
+  - [docker-compose.dev.yml](mdc:docker-compose.dev.yml) is used for Anthias in development mode (e.g., in a laptop or
+    personal computer).
+  - [docker-compose.balena.yml.tmpl](mdc:docker-compose.balena.yml.tmpl) is used for instances installed on devices that runs
+    balenaOS.
+  - The [docker](mdc:docker) directory contains all the necessary Dockerfiles needed by Anthias.
+- The [requirements](mdc:requirements) directory contains all the requirements files required by Anthias
+- [webview](mdc:webview) contains C++ (Qt) source code necessary for the WebView, which is
+  a custom-built web browser that makes display of assets (images, videos, or web pages) in
+  a connected display (like a TV) possible.
+- [viewer](mdc:viewer) contains the Python source files used by the viewer service, which is
+  responsible for driving a screen to display content.

.cursor/rules/javascript.mdc

@@ -0,0 +1,10 @@
+---
+description: 
+globs: 
+alwaysApply: true
+---
+- CoffeeScript is used for front-end code, which gets transpiled to JavaScript.
+  - See [anthias.coffee](mdc:static/js/anthias.coffee) and [settings.coffee](mdc:static/js/settings.coffee) for details.
+- Backbone.js is used as the front-end framework.
+- CoffeeScript and Backbone.js will be deprecated in favor of modern frameworks
+  that are more stable and still maintained.

.cursor/rules/python.mdc

@@ -0,0 +1,10 @@
+---
+description: 
+globs: 
+alwaysApply: true
+---
+- Most of Anthias' source code is written in Python.
+- Django is used as the web framework.
+- [Ruff](mdc:https:/github.com/astral-sh/ruff) is used for linting and formatting Python files.
+  - See [pyproject.toml](mdc:pyproject.toml) for linting and formatting rules.
+- Use [type hints](mdc:https:/docs.python.org/3/library/typing.html) when updating and generating Python files.

.cursor/rules/qt.mdc

@@ -0,0 +1,10 @@
+---
+description: 
+globs: 
+alwaysApply: true
+---
+- The [webview](mdc:webview) consists of purely C++ files.
+- The WebView binary used for Raspberry Pi (1 to 4) devices uses Qt 5. 
+- The WebView binary used for Raspberry Pi 5 and x86 devices uses Qt 6.
+- Use C++ macros when updating or generating code so that changes support
+  both Qt 5 and Qt 6 code.

.github/workflows/docker-build.yaml

@@ -21,6 +21,7 @@ on:
       - '!bin/start_development_server.sh'
       - '!tests/**'
       - '!docker/Dockerfile.dev'
+      - '!.cursor/**'
 
 jobs:
   run-tests:

.github/workflows/docker-test.yaml

@@ -13,6 +13,7 @@ on:
       - '!.github/workflows/build-webview.yaml'
       - '!.github/workflows/build-balena-disk-image.yaml'
       - '!docs/**'
+      - '!.cursor/**'
   pull_request:
     branches:
       - master
@@ -24,6 +25,7 @@ on:
       - '!.github/workflows/build-webview.yaml'
       - '!.github/workflows/build-balena-disk-image.yaml'
       - '!docs/**'
+      - '!.cursor/**'
   workflow_call:
 
 jobs:

.github/workflows/generate-openapi-schema.yml

@@ -18,6 +18,7 @@ on:
       - '!bin/install.sh'
       - '!bin/upgrade_containers.sh'
       - '!tests/**'
+      - '!.cursor/**'
   pull_request:
     branches:
       - master
@@ -34,6 +35,7 @@ on:
       - '!bin/install.sh'
       - '!bin/upgrade_containers.sh'
       - '!tests/**'
+      - '!.cursor/**'
   workflow_call:
     inputs:
       release: