The remaining copies of the origin, app and report refusals import src/actions/origin_app_words.ts #5692

Follow-up to #5647 / #5690. After #5690, grep -rn under src/ still finds the sentences outside src/actions/origin_app_words.ts:

• src/origins/mirror.ts:300 — exact copy of "the origin could not be reached" (a pure move)
• src/actions/migrate.ts:666 — inside a template string
• src/contract/openapi.ts:48 and :732 — the contract's error descriptions
• src/tui/screens/common.ts:883 — the terminal says "…; nothing changed" while the API says "…; nothing was changed". Making the terminal match is a wording change. Decide it on purpose, and update the tests that pin it.

Done: each of the files above imports the constant, grep -rn for each sentence under src/ finds only the module, and test/origin-app-words.test.ts adds these files to its DOORS list.

Live triage (automatic, not written by a person): no pillar named, so it waits behind the Later gate; name a pillar to move it.