fix: Increase max tokens for document generation to prevent truncation

- PRD: 4000 → 6000 tokens, timeout 120s → 150s
- Tech Spec: 4000 → 8000 tokens, timeout 120s → 180s

Tech specs were getting truncated mid-content due to insufficient token limits.

Author: MujahidAbbas

app/Jobs/GeneratePrdJob.php

@@ -84,10 +84,10 @@ public function handle(): void
 
             $response = Prism::text()
                 ->using($providerEnum, $run->model)
-                ->withMaxTokens(4000)
+                ->withMaxTokens(6000)
                 ->withSystemPrompt($system)
                 ->withPrompt($prompt)
-                ->withClientOptions(['timeout' => 120])
+                ->withClientOptions(['timeout' => 150])
                 ->asText();
 
             // Store rate limit info from successful response

app/Jobs/GenerateTechSpecJob.php

@@ -89,10 +89,10 @@ public function handle(): void
 
             $response = Prism::text()
                 ->using($providerEnum, $run->model)
-                ->withMaxTokens(4000)
+                ->withMaxTokens(8000)
                 ->withSystemPrompt($system)
                 ->withPrompt($prompt)
-                ->withClientOptions(['timeout' => 120])
+                ->withClientOptions(['timeout' => 180])
                 ->asText();
 
             // Store rate limit info from successful response