New library for backend adaption

.changeset/backend-adaptation-improvements.md

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+---
+"@burnt-labs/abstraxion-backend": minor
+"@burnt-labs/abstraxion-core": minor
+"@burnt-labs/tailwind-config": patch
+---
+
+# Backend adaptation improvements
+
+Core changes:
+
+- Added gas price configuration to the AbstraxionAuth's getSigner method
+
+Backend changes:
+
+- Added comprehensive error handling system with custom error classes
+- Enhanced session key management with improved validation and refresh logic
+- Added audit logging capabilities for security and compliance
+- Improved state management with automatic cleanup using node-cache
+- Added encryption service integration for secure session key storage
+- Enhanced database adapter interface with audit event support
+- Added configuration validation with proper error messages
+- Added session key expiry and refresh threshold management
+- Enhanced security with proper error propagation and logging

apps/backend-session/.eslintrc.js

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+module.exports = {
+  root: true,
+  extends: ["@burnt-labs/eslint-config-custom/next"],
+  rules: {
+    "no-console": ["error", { allow: ["warn", "error"] }],
+    "no-alert": "off",
+    "import/no-default-export": "off",
+  },
+  env: {
+    node: true,
+    es2022: true,
+  },
+  parserOptions: {
+    ecmaVersion: 2022,
+    sourceType: "module",
+  },
+  ignorePatterns: ["node_modules/", "dist/", ".next/"],
+};

apps/backend-session/.gitignore

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+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+/.pnp
+.pnp.js
+.yarn/install-state.gz
+
+# testing
+/coverage
+
+# next.js
+/.next/
+/out/
+
+# production
+/build
+
+# misc
+.DS_Store
+*.pem
+
+# debug
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# local env files
+.env*.local
+.env
+
+# vercel
+.vercel
+
+# typescript
+*.tsbuildinfo
+next-env.d.ts
+
+# prisma
+/prisma/dev.db
+/prisma/dev.db-journal
+/prisma/test.db
+
+# IDE
+.vscode/
+.idea/
+
+# OS
+Thumbs.db