refactor(api): remove AI worker, add ai api route, add usage tiers

- Remove separate AI worker service
- Added generation limits:
  FREE: 1000/month (For the beta version)
  PRO: 500/month
  ENTERPRISE: 1000/month
- Integrate AI functionality into main API routes
- Added monthly generations reset and usage tier upgrade API routes
- Upgrade tier page to be added along with profile page section

frontend/lib/tiers.ts

@@ -0,0 +1,19 @@
+export const TIERS = {
+    FREE: {
+      //   generations: 100, 
+      //   maxTokens: 1024,
+      generations: 1000,
+      maxTokens: 4096,
+      model: "claude-3-5-sonnet-20240620",
+    },
+    PRO: {
+      generations: 500,
+      maxTokens: 2048,
+      model: "claude-3-5-sonnet-20240620",
+    },
+    ENTERPRISE: {
+      generations: 1000,
+      maxTokens: 4096,
+      model: "claude-3-5-sonnet-20240620",
+    },
+}

frontend/lib/types.ts

@@ -10,6 +10,9 @@ export type User = {
   generations: number
   sandbox: Sandbox[]
   usersToSandboxes: UsersToSandboxes[]
+  tier: "FREE" | "PRO" | "ENTERPRISE"
+  tierExpiresAt: Date
+  lastResetDate?: number
 }
 
 export type Sandbox = {