feat(admin): add module settings to toggle trading feature

Introduce module_settings table to store global feature flags
Add admin UI to enable or disable the Trading module
Hide trading-related UI and skip data fetching when disabled

AGENTS.md

@@ -223,11 +223,19 @@ This project is developed from WSL, but runtime validation is done through Docke
 
 Agent workflow:
 
-* Run when practical:
+* Run once when practical:
 
   * `pnpm lint`
   * `pnpm typecheck`
 
+* Do not repeatedly retry failed validation commands.
+* If lint/typecheck fails because of missing dependencies, native optional bindings, WSL, network, registry, filesystem permission, or other environment/setup issues:
+
+  * Do not repeatedly run `pnpm install`, force reinstall dependencies, delete `node_modules`, or otherwise spend time repairing the local environment unless the user explicitly asks.
+  * Report the exact command attempted and the key error lines.
+  * Tell the user what command to run locally or in Docker.
+  * Wait for the user to paste `docker compose up --build`, lint, typecheck, or runtime output before fixing follow-up errors.
+
 * Do NOT run tests in WSL.
 * Do NOT require local test execution before finishing a task.
 * The user will run `docker compose up --build`.
@@ -246,7 +254,7 @@ A task is complete ONLY IF:
 * Minimal diff, with no unrelated changes.
 * No UI leaks of internal info.
 * Code is readable and concise.
-* Passes lint/typecheck when practical.
+* Lint/typecheck has been run once when practical, or the environment blocker and user-side validation command have been reported.
 * Docker runtime issues are handled from user-provided `docker compose up --build` output.
 
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