Initial commit: Complete NodeJS-native setup

- Migrated from Python pre-commit to NodeJS-native solution
- Reorganized documentation structure
- Set up Husky + lint-staged for efficient pre-commit hooks
- Fixed Dockerfile healthcheck issue
- Added comprehensive documentation index

.secretlintrc.json

@@ -0,0 +1,12 @@
+{
+  "rules": [
+    {
+      "id": "@secretlint/secretlint-rule-preset-recommend"
+    }
+  ],
+  "allowMessageIds": [],
+  "disabledMessages": [],
+  "reporterOptions": {
+    "formatter": "table"
+  }
+}