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/api-server/server-core.ts

@@ -349,7 +349,7 @@ export class AgentApiServer {
     companyId: string,
     refs: Array<{ id: string | null | undefined; table: "agents" | "goals" | "projects" | "tasks" | "workspaces" | "approvals"; label: string }>,
   ) {
-    const invalid = refs.find((ref) => ref.id && !this._db.belongsToCompany(ref.table, ref.id, companyId));
+    const invalid = refs.find((ref) => ref.id && !this._db.settings.belongsToCompany(ref.table, ref.id, companyId));
     if (!invalid) return false;
     this.json(res, 422, { error: `${invalid.label} does not belong to the current company` });
     return true;