Add structured backend logging with pino

Wires leveled, structured logging (pretty in dev, JSON in prod) through
the server lifecycle, HTTP/WS request handling, run engine, auth, db,
and config loading. CLI command output is left untouched since it's
user-facing terminal UX, not backend logs.

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

package.json

@@ -1,6 +1,6 @@
 {
   "name": "triggershell",
-  "version": "0.1.0",
+  "version": "1.0.4",
   "license": "MIT",
   "type": "module",
   "repository": {
@@ -60,6 +60,7 @@
     "lucide-react": "^1.31.0",
     "next": "16.3.1",
     "next-themes": "^0.4.6",
+    "pino": "^10.3.1",
     "react": "19.2.8",
     "react-dom": "19.2.8",
     "react-hook-form": "^7.85.0",
@@ -86,6 +87,7 @@
     "drizzle-kit": "^0.31.10",
     "eslint": "^9",
     "eslint-config-next": "16.3.1",
+    "pino-pretty": "^13.1.3",
     "prettier": "^3.9.6",
     "prettier-plugin-tailwindcss": "^0.8.1",
     "tailwindcss": "^4",