Refactor: Use @simpleworkjs/conf for configuration

- Replace ENV vars with proper config system
- Add conf/ directory with base, development, production, secrets
- Add secrets.example.js template
- Update .gitignore for secrets.js
- Show environment in startup banner

package-lock.json

@@ -8,6 +8,7 @@
       "name": "openclaw-webui",
       "version": "1.0.0",
       "dependencies": {
+        "@simpleworkjs/conf": "^1.0.0",
         "eventsource": "^2.0.2",
         "express": "^4.18.2",
         "express-session": "^1.17.3",
@@ -870,6 +871,18 @@
         "win32"
       ]
     },
+    "node_modules/@simpleworkjs/conf": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/@simpleworkjs/conf/-/conf-1.0.0.tgz",
+      "integrity": "sha512-p1dQAELW0oUBRpDoz260TYw18IMI/Y11xYAb17P1MEPjsTAUB0LWE/6ZeA2VQmpU/LXoRnDysg0G/oASGILyUA==",
+      "license": "MIT",
+      "dependencies": {
+        "extend": "^3.0.2"
+      },
+      "engines": {
+        "node": ">=16.0.0"
+      }
+    },
     "node_modules/@types/estree": {
       "version": "1.0.8",
       "resolved": "https://registry.npmjs.org/@types/estree/-/estree-1.0.8.tgz",
@@ -1435,6 +1448,12 @@
         "url": "https://opencollective.com/express"
       }
     },
+    "node_modules/extend": {
+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/extend/-/extend-3.0.2.tgz",
+      "integrity": "sha512-fjquC59cD7CyW6urNXK0FBufkZcoiGG80wTuPujX590cB5Ttln20E2UB4S/WARVqhXffZl2LNgS+gQdPIIim/g==",
+      "license": "MIT"
+    },
     "node_modules/extsprintf": {
       "version": "1.4.1",
       "resolved": "https://registry.npmjs.org/extsprintf/-/extsprintf-1.4.1.tgz",