Add StandardJS lint CI (non-blocking)

[alreemt]

Summary
Added StandardJS as our static analysis tool for the Project 3 Tools Checkpoint.
StandardJS performs zero-config JavaScript style enforcement to identify code style
violations in NodeBB.

Tool Type
Static Analysis (Code Style & Quality)
Purpose
Detect style violations such as extra semicolons, indentation issues, and coding
standard violations.

Installation Evidence
Installed via npm as dev dependency using npm install -D standard.
Verified installation via npx standard --version → v17.1.2.

Execution Evidence
Test files: Root JS files and src/routes/index.js
Output: standard-evidence/standard_output.txt
Command used: npx standard "*.js" "src/routes/index.js"

Files Added

File	Description
.standardignore	Ignore patterns for vendor files
.github/workflows/standard.yml	CI workflow for StandardJS
standard-evidence/standard_execution.md	Execution documentation
standard-evidence/standard_output.txt	Terminal output evidence