Set project license to Apache-2.0 and fix all references

[aram356]

Summary

Standardize the project license to Apache-2.0 across the entire repository. There are currently inconsistent license declarations (some files say MIT, some say Apache-2.0, and some are missing entirely).

Changes needed

Create

• Add LICENSE file with the full Apache License 2.0 text (Copyright 2025-present Stackpop)

Fix incorrect references (MIT -> Apache-2.0)

• README.md — license section says "MIT"
• docs/.vitepress/config.mts — footer says "Released under the MIT License."
• docs/package.json — "license": "MIT"

Add missing license fields

• crates/edgezero-cli/Cargo.toml — no license field
• crates/edgezero-adapter/Cargo.toml — no license field
• examples/app-demo/Cargo.toml — no [workspace.package] license
• examples/app-demo/crates/app-demo-core/Cargo.toml — no license field
• examples/app-demo/crates/app-demo-adapter-axum/Cargo.toml — no license field
• examples/app-demo/crates/app-demo-adapter-cloudflare/Cargo.toml — no license field
• examples/app-demo/crates/app-demo-adapter-fastly/Cargo.toml — no license field

Update

• TODO.md — mark the "License and contribution guidelines" open design question as resolved

Notes

• The root Cargo.toml workspace already declares license = "Apache-2.0" and 5 crates inherit it correctly (edgezero-core, edgezero-macros, edgezero-adapter-cloudflare, edgezero-adapter-fastly, edgezero-adapter-axum)
• Example crates use publish = false so the license field isn't required for crates.io, but should be set for consistency