docs: reconcile README and add Burmese translation

[shayyz-code]

Summary

• distinguish the planned compiled backend from the available legacy interpreter
• correct installation, CLI, syntax, example, CI, and release claims
• add a full Burmese README counterpart
• update the roadmap audit status

Issue

Closes #15

Verification

• embedded legacy example (20, then Result: Int(10))
• cargo run --quiet -- examples/app.poo
• cargo run --release --quiet -- examples/donut.poo (rendered; interrupted)
• mdbook build docs
• mdbook test docs
• oranda build
• cargo fmt --all -- --check
• cargo check --all-targets
• cargo clippy --all-targets --all-features -- -D warnings
• cargo test
• actionlint

Documentation and visual impact

README landing content and structure changed; the banner is retained and Burmese language navigation is added.

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