refactor: remove pre-2026.4 compatibility shims and legacy migrations (#104650)

* refactor(matrix): retire pre-2026.4 legacy crypto and flat-storage migrations

* refactor(cli): drop pre-tsdown daemon-cli dist compat shim from the build

* refactor(diffs): remove deprecated image*/format tool params and output aliases

* refactor(ui): drop pre-gateway-scoped localStorage readers and legacy theme map

* refactor: remove assorted pre-2026.4 compat shims and deprecated aliases

* fix(discord): map legacy thread-binding fields in the doctor JSON import

* fix(msteams): keep bot read fallback for legacy imported conversation rows

* test(msteams): cover legacy bot-only imported conversation references

* fix(ui): keep channel-prefixed session key display fallback

* chore: refresh native i18n inventory and build-docker step count

* chore(matrix): drop now-unused migration-config module

* chore: re-pin plugin SDK public export budget after compat removals

* chore: refresh native i18n inventory after rebase

* chore: re-pin plugin SDK callable budget and refresh i18n inventory after rebase

docs/docs_map.md

@@ -538,14 +538,10 @@ Do not edit it by hand; run `pnpm docs:map:gen`.
 - Route: /channels/matrix-migration
 - Headings:
   - H2: What the migration does automatically
-  - H2: What the migration cannot do automatically
+  - H2: Upgrading from OpenClaw releases older than 2026.4
   - H2: Recommended upgrade flow
-  - H2: How encrypted migration works
   - H2: Common messages and what they mean
-  - H3: Upgrade and detection messages
-  - H3: Encrypted-state recovery messages
   - H3: Manual recovery messages
-  - H3: Custom plugin install messages
   - H2: If encrypted history still does not come back
   - H2: If you want to start fresh for future messages
   - H2: Related