first update to external config values

src/Config/PromptBuilderConfig.php

@@ -6,64 +6,101 @@ namespace App\Config;
 
 final class PromptBuilderConfig
 {
+    /**
+     * @param array<string, mixed> $config
+     */
+    public function __construct(
+        private readonly array $config = [],
+    ) {
+    }
+
     public function getCharsPerToken(): int
     {
-        return 4;
+        return $this->getInt('budget.chars_per_token', 4);
     }
 
     public function getHistoryPaddingChars(): int
     {
-        return 400;
+        return $this->getInt('budget.history_padding_chars', 400);
     }
 
     public function getOutputReserveRatio(): float
     {
-        return 0.25;
+        return $this->getFloat('budget.output_reserve_ratio', 0.25);
     }
 
     public function getOutputReserveMinTokens(): int
     {
-        return 768;
+        return $this->getInt('budget.output_reserve_min_tokens', 768);
     }
 
     public function getOutputReserveMaxTokens(): int
     {
-        return 6000;
+        return $this->getInt('budget.output_reserve_max_tokens', 6000);
     }
 
     public function getSafetyReserveRatio(): float
     {
-        return 0.05;
+        return $this->getFloat('budget.safety_reserve_ratio', 0.05);
     }
 
     public function getSafetyReserveMinTokens(): int
     {
-        return 256;
+        return $this->getInt('budget.safety_reserve_min_tokens', 256);
     }
 
     public function getSafetyReserveMaxTokens(): int
     {
-        return 1024;
+        return $this->getInt('budget.safety_reserve_max_tokens', 1024);
     }
 
     public function getMinPromptBudgetTokens(): int
     {
-        return 1024;
+        return $this->getInt('budget.min_prompt_budget_tokens', 1024);
     }
 
     public function getMaxShopResultsInPrompt(): int
     {
-        return 24;
+        return $this->getInt('shop_results.max_results_in_prompt', 24);
     }
 
     public function getDetailedShopResultsMaxCount(): int
     {
-        return 5;
+        return $this->getInt('shop_results.detailed_max_count', 5);
     }
 
     public function getTechnicalProductKeywordMatchThreshold(): int
     {
-        return 2;
+        return $this->getInt('technical_product_keyword_match_threshold', 2);
+    }
+
+    private function getInt(string $path, int $default): int
+    {
+        $value = $this->getValue($path, $default);
+
+        return is_numeric($value) ? (int) $value : $default;
+    }
+
+    private function getFloat(string $path, float $default): float
+    {
+        $value = $this->getValue($path, $default);
+
+        return is_numeric($value) ? (float) $value : $default;
+    }
+
+    private function getValue(string $path, mixed $default): mixed
+    {
+        $current = $this->config;
+
+        foreach (explode('.', $path) as $segment) {
+            if (!is_array($current) || !array_key_exists($segment, $current)) {
+                return $default;
+            }
+
+            $current = $current[$segment];
+        }
+
+        return $current;
     }
 
     public function getSystemSectionLabel(): string