WASM plugins, scripting, i18n, GUI pan/zoom, cargo-dist CI/CD

- WASM plugin host (wasmtime 46, 17 host fns) + example noisemap plugin
- Rhai scripting engine (12 API fns, `terrafier run` cmd)
- i18n: en/ru translations, auto-detect, t! macro
- GUI: pan (click-drag) + zoom (scroll wheel) with viewport transform
- cargo-dist 0.31: MSI/pkg/shell installers, both binaries
- CI: .github/workflows/ci.yml + release.yml
- Security: wasmtime 30→46, bincode 1.3→2.0, quick-xml CVE docs
- Code review: SAFETY comments, unwrap→match cleanup
- Fixes: clippy approx_constant, needless_borrows, rustfmt

crates/wasm-host/Cargo.toml

@@ -0,0 +1,17 @@
+[package]
+name = "terrafier-wasm-host"
+version.workspace = true
+edition.workspace = true
+license.workspace = true
+description = "WASM plugin host for Terrafier using wasmtime"
+
+[dependencies]
+wasmtime = "46"
+terrafier-core = { path = "../../core" }
+anyhow.workspace = true
+thiserror.workspace = true
+log.workspace = true
+
+[dev-dependencies]
+tempfile = "3"
+wat = "1"