Centralize ESLint into a single root config

Replace the duplicated per-workspace eslint.config.mjs files in
apps/console, apps/trust, packages/ui, and packages/eslint-config with
one root eslint.config.mjs that reuses the shared @probo/eslint-config
rule sets and scopes them per directory. Linting now runs from the repo
root, so pin the type-checked project service root and broaden the
import-x resolver to every workspace tsconfig (the #/* aliases live in
each app's tsconfig.app.json).

Drop the now-redundant per-package lint scripts and lint-only devDeps,
and add a root lint script that runs eslint over the four dirs with
multithreading restored via --concurrency auto, then lints n8n-node
through a direct workspace call. packages/n8n-node keeps its own
external preset.

Collapse the redundant lint-js -> npm-lint Makefile chain into a single
lint-js target and update the make docs accordingly.

Signed-off-by: Émile Ré <emile@probo.com>

packages/eslint-config/eslint.config.mjs

@@ -1,15 +0,0 @@
-import { defineConfig } from "eslint/config";
-
-import { baseConfigs } from "#baseConfigs";
-import { importsConfigs } from "#importsConfigs";
-import { nodeLanguageOptionsConfigs } from "#languageOptionsConfigs";
-import { stylisticConfigs } from "#stylisticConfigs";
-import { tsConfigs } from "#tsConfigs";
-
-export default defineConfig([
-  ...baseConfigs,
-  ...tsConfigs,
-  ...importsConfigs,
-  ...stylisticConfigs,
-  ...nodeLanguageOptionsConfigs,
-]);

packages/eslint-config/package.json

@@ -19,9 +19,7 @@
     "#languageOptionsConfigs": "./src/languageOptionsConfigs.ts",
     "#stylisticConfigs": "./src/stylisticConfigs.ts"
   },
-  "scripts": {
-    "lint": "eslint src"
-  },
+  "scripts": {},
   "keywords": [],
   "author": "",
   "license": "ISC",

packages/eslint-config/src/importsConfigs.ts

@@ -47,7 +47,12 @@ export const importsConfigs: FlatConfig.ConfigArray = [
     settings: {
       "import-x/resolver-next": createTypeScriptImportResolver({
         alwaysTryTypes: true,
-        project: "tsconfig.json",
+        // Linting runs from the repo root, so resolve every workspace's
+        // tsconfig rather than a single cwd-relative one. The `#/*` path
+        // aliases live in the per-app `tsconfig.app.json`, so match all
+        // tsconfig variants, not just the references-only `tsconfig.json`.
+        project: ["apps/*/tsconfig*.json", "packages/*/tsconfig*.json"],
+        noWarnOnMultipleProjects: true,
       }),
     },
   },