Flatten the repo: move everything out of app/ to the root

Now that the CLI and the Next.js app are one package, nesting it inside
app/ served no purpose - the repo root itself becomes the published
npm package. Merges app/.gitignore and app/README.md into the root
versions, drops the now-duplicate app/LICENSE, and updates path
references (README, docs/ARCHITECTURE.md, docs/CONFIG_REFERENCE.md,
package.json's repository.directory) that assumed the app/ nesting.

Also fixes a real bug this surfaced: the in-app docs viewer resolved
docs/ relative to process.cwd(), which only worked by accident when the
CLI happened to be invoked from app/'s parent directory. A first attempt
at fixing it with import.meta.dirname broke instead, for the same
cross-module-graph reason config-path resolution already documented -
Next compiles Route Handlers through a separate module graph that
doesn't preserve source-relative import.meta paths. Fixed by exposing
the app root via TRIGGERSHELL_APP_ROOT (set once in server.ts, where
import.meta *does* resolve correctly), the same pattern already used
for TRIGGERSHELL_CONFIG_PATH.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/cli/commands/init.ts

@@ -0,0 +1,50 @@
+import crypto from "node:crypto";
+import fs from "node:fs";
+import path from "node:path";
+import { resolveAppRoot } from "../lib/paths";
+
+const DEFAULT_CONFIG_NAME = "triggershell.yml";
+
+export interface InitOptions {
+  port: number;
+  auth: boolean;
+  force: boolean;
+}
+
+export async function initCommand(targetPath: string | undefined, opts: InitOptions): Promise<void> {
+  const targetDir = path.resolve(process.cwd(), targetPath ?? ".");
+  fs.mkdirSync(targetDir, { recursive: true });
+  const configPath = path.join(targetDir, DEFAULT_CONFIG_NAME);
+
+  if (fs.existsSync(configPath) && !opts.force) {
+    console.error(`${configPath} already exists. Use --force to overwrite.`);
+    process.exitCode = 1;
+    return;
+  }
+
+  const templatePath = path.join(resolveAppRoot(), "templates", DEFAULT_CONFIG_NAME);
+  const template = fs.readFileSync(templatePath, "utf-8");
+  const rendered = template
+    .replace("__PORT__", String(opts.port))
+    .replace("__AUTH_ENABLED__", opts.auth ? "true" : "false");
+  fs.writeFileSync(configPath, rendered);
+  console.log(`Created ${configPath}`);
+
+  const envPath = path.join(targetDir, ".env");
+  if (opts.auth) {
+    if (fs.existsSync(envPath)) {
+      console.log(
+        `${envPath} already exists - make sure it sets TRIGGERSHELL_SESSION_SECRET (>= 32 chars).`,
+      );
+    } else {
+      const sessionSecret = crypto.randomBytes(32).toString("hex");
+      fs.writeFileSync(envPath, `TRIGGERSHELL_SESSION_SECRET=${sessionSecret}\n`);
+      console.log(`Created ${envPath} (keep this out of version control)`);
+    }
+    console.log("\nAuth is enabled but no users are configured yet. Add one with:");
+    console.log(`  triggershell users add <username> --config ${configPath}`);
+  }
+
+  console.log("\nStart the app with:");
+  console.log(`  triggershell start --config ${configPath}`);
+}