Codemod db pass-through calls: messages + runs + approvals + company (C1 part 2/3)

Rewrite ~376 call sites for messages, runs, approvalsMod, and company
domains and delete the corresponding pass-through methods on
AppDatabase / AppDatabaseBase. Structural type references
(ReturnType<HandlerDeps["db"]["getRun"]>) and SweepStaleReviewsDeps-style
mocks are updated to route through the owning sub-module.

src/main/worker/observability/run-event-recorder.ts

@@ -22,7 +22,7 @@ export function persistRunEvent(
   input: PersistInput,
 ) {
   try {
-    db.appendRunEvent(input);
+    db.runs.appendRunEvent(input);
   } catch (error) {
     logger.warn(
       `[run-events] Failed to append ${input.eventType} for ${input.runId}: ${