Manifests: declare the actual execution kind of every capsule #184

Part of #173 (isolation plan).

Home and app manifests say type: wasm with execution web-projection, because elastos/crates/elastos-common/src/manifest.rs:769-777 requires it. Provider manifests say type: microvm, but they run as native processes (the provider entries in components.json are substrate native). The manifests do not state what actually runs.

Done means

• The manifest validator accepts an honest type for web projections and for native providers.
• Every first-party manifest states its actual execution.
• Regression test: the validator rejects a manifest whose type contradicts its execution.