Remove final AppDatabase pass-through methods with ESLint guard (C1 part 3/3)

Migrate all remaining pass-through call sites (social, skills, budget,
entityCrud, documents, knowledge, automation, wakeup, backup, threads,
settings, snapshot, connectors, workspaces, activity) to their owning
domain modules. `AppDatabase` now carries only three methods:

  - createHireRequest (multi-module composite: agents + approvalsMod)
  - rollbackConfigRevision (multi-module composite: documents + entityCrud)
  - queryAll (raw-SQL escape hatch, @internal)

The vault/env-binding infrastructure previously passed argument-by-
argument into `entityCrud.saveSecret`/`resolveSecretEnv` now binds at
module construction, letting callers invoke `db.entityCrud.saveSecret({...})`
without carrying vault plumbing.

Structural types that narrowed AppDatabase to a bag of flat methods
(`ConnectorModelPolicyDeps` callers, `CapabilityMatchDb`, test mocks in
budget-enforcement / budget-incidents / task-quality-gates /
failure-escalation / task-quality-gates-sweep) are reshaped to the new
namespace. `connectorPolicyDepsFromDb` replaces the old pattern of
handing the whole AppDatabase to `validateConnectorModelSelection`.

A new ESLint rule in eslint.config.mjs blocks new top-level methods on
AppDatabase so the pass-through layer cannot silently grow back.
`AppDatabase.ts` dropped from 193 lines to 58; `AppDatabaseBase` lost
the 270-line trailing pass-through block.

src/main/hire-hook.ts

@@ -77,7 +77,7 @@ export async function notifyHireApproved(
     };
 
     log.info(`[hire-hook] Hire approved for agent ${agent.name} (${input.agentId}) on connector ${connectorDef.id}`);
-    db.addActivity({
+    db.activityMod.addActivity({
       companyId: input.companyId,
       actor: "system",
       action: "hire_hook.success",
@@ -95,7 +95,7 @@ export async function notifyHireApproved(
     const message = error instanceof Error ? error.message : String(error);
     log.error(`[${classified.code}] ${classified.message}: ${message}`);
     try {
-      db.addActivity({
+      db.activityMod.addActivity({
         companyId: input.companyId,
         actor: "system",
         action: "hire_hook.exception",