Split microsvc/service.rs routes vs causal vs runtime

[patrickleet]

Implements [[tasks/rust-less-context-17]]

Stacked on #127 / tasks--graphql-qs-epic.

Summary

• Replaced src/microsvc/service.rs with src/microsvc/service/mod.rs and concern modules for handlers, causal helpers, routes, runtime, defaults, helpers, request/response DTOs, and tests.
• Preserved the existing microsvc::service API surface with pub use from mod.rs; no intentional behavior change.
• Rebased onto origin/tasks--graphql-qs-epic at 380ef5f before final verification.

Verification

• cargo test --lib microsvc::service - passed, 27 tests.
• cargo test --features graphql,sqlite --lib microsvc - passed, 82 tests.
• cargo test --features graphql,sqlite --test graphql_sqlite 2>/dev/null || true - passed, 7 tests.

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