Embed dashboard assets and coordinate single-binary startup flows

[yacosta738]

Summary

Package compiled web assets into the Rust binary and define the startup model for API, admin services, and TUI so local-first installation remains one command and one artifact.

Why this matters

This is one of the smallest independently shippable slices needed to make the parent issue real without mixing concerns or leaking product logic across layers.

Parent issue

#573 Corvus Rook foundation: package layout, shared services, and single-binary bootstrap

Scope

• deliver the parent issue slice described in the title
• keep contracts reusable by the other Rook surfaces where applicable
• add or update targeted validation for the new behavior

Acceptance criteria

• the scope in this issue is implemented end to end
• behavior is covered by targeted tests or an explicit validation strategy
• the resulting contract is documented where operators or other developers need it

References

• tmp/2026-04-19-local-first-provider-gateway-prd-rfc.md §3.1, §10.2F, §17.1

[linear]

DALLAY-294