[adm 5] Execute canonical generated API database operations

[artiphishle]

Roadmap: ankhorage/studio#115
Parent issue: ankhorage/studio#120

Why this release boundary exists

Studio Phase 4 cannot consume the released Contracts 4 / Data Sources 1 generated API model while Runtime remains on the removed manifest.data.apis and pre-taxonomy data-source contracts. This PR migrates the owning Runtime package before Studio continues, without compatibility aliases or a parallel legacy path.

Changes

• consume @ankhorage/contracts@^4.0.2 and @ankhorage/data-sources@^1.0.0
• remove the obsolete runtimeApiLoaders / manifest.data.apis seed-loader surface
• keep screen loading on canonical operation data loaders only
• route protocol: 'database' generated API operations through the referenced injected DbAdapter
• preserve external REST/GraphQL operation execution through @ankhorage/data-sources
• support generated list/read/create/update/delete result shapes and structured diagnostics
• migrate Runtime fixtures to kind: 'api', origin: 'external', protocol: 'rest'
• regenerate Paradox docs and add a major changeset

Validation

The final migration runner passed build, typecheck, lint, format check, Knip, 91 tests, docs generation, and committed changeset status before pushing the validated commit.

After this PR is merged and Runtime is released, [adm 5] Phase 4 continues in Studio against the released Runtime major.