bug #719 [AI Bundle] Preserve boolean options in agent/vectorizer model confguration (sonnymilton)

This PR was squashed before being merged into the main branch.

Discussion
----------

[AI Bundle] Preserve boolean options in agent/vectorizer model confguration

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes <!-- please update src/**/CHANGELOG.md files -->
| Docs?         | no <!-- required for new features -->
| Issues        | - <!-- prefix each issue number with "Fix #", no need to create an issue if none exist, explain below instead -->
| License       | MIT

## Problem
When configuring models in `symfony/ai-bundle` via the `options` section, boolean values were **misrepresented**.
This happens because `http_build_query()` converts booleans into integers:
- `true` → `1`
- `false` → `0`

So configuration like:

```yaml
ai:
  agent:
    my_agent:
      model:
        name: gpt-4o-mini
        options:
          stream: false
```

Converted to `gpt-4o-mini?stream=0`
Expected: `gpt-4o-mini?stream=false`

This makes it impossible to distinguish between a booleans and an integers during parsing.

## Changes
 - Inline normalization of options before calling `http_build_query()`. Booleans are explicitly converted to the strings `"true"` / `"false"`.
- Added regression tests for both agents and vectorizers.

Commits
-------

f107a20 [AI Bundle] Preserve boolean options in agent/vectorizer model confguration

Author: OskarStark

src/ai-bundle/config/options.php

@@ -271,6 +271,12 @@
                                         return $model;
                                     }
 
+                                    array_walk_recursive($options, static function (mixed &$value): void {
+                                        if (\is_bool($value)) {
+                                            $value = $value ? 'true' : 'false';
+                                        }
+                                    });
+
                                     return $model.'?'.http_build_query($options);
                                 })
                             ->end()
@@ -698,6 +704,12 @@
                                         return $model;
                                     }
 
+                                    array_walk_recursive($options, static function (mixed &$value): void {
+                                        if (\is_bool($value)) {
+                                            $value = $value ? 'true' : 'false';
+                                        }
+                                    });
+
                                     return $model.'?'.http_build_query($options);
                                 })
                             ->end()

src/ai-bundle/tests/DependencyInjection/AiBundleTest.php

@@ -2583,6 +2583,58 @@ public function testVectorizerConfigurationWithColonNotation(string $model)
         $this->assertSame($model, $definition->getArgument(1));
     }
 
+    public function testAgentModelBooleanOptionsArePreserved()
+    {
+        $container = $this->buildContainer([
+            'ai' => [
+                'agent' => [
+                    'test' => [
+                        'model' => [
+                            'name' => 'qwen3',
+                            'options' => [
+                                'stream' => false,
+                                'think' => true,
+                                'nested' => [
+                                    'bool' => false,
+                                ],
+                            ],
+                        ],
+                    ],
+                ],
+            ],
+        ]);
+
+        $agentDefinition = $container->getDefinition('ai.agent.test');
+
+        $this->assertSame('qwen3?stream=false&think=true&nested%5Bbool%5D=false', $agentDefinition->getArgument(1));
+    }
+
+    public function testVectorizerModelBooleanOptionsArePreserved()
+    {
+        $container = $this->buildContainer([
+            'ai' => [
+                'vectorizer' => [
+                    'test' => [
+                        'model' => [
+                            'name' => 'text-embedding-3-small',
+                            'options' => [
+                                'normalize' => false,
+                                'cache' => true,
+                                'nested' => [
+                                    'bool' => false,
+                                ],
+                            ],
+                        ],
+                    ],
+                ],
+            ],
+        ]);
+
+        $vectorizerDefinition = $container->getDefinition('ai.vectorizer.test');
+
+        $this->assertSame('text-embedding-3-small?normalize=false&cache=true&nested%5Bbool%5D=false', $vectorizerDefinition->getArgument(1));
+    }
+
     private function buildContainer(array $configuration): ContainerBuilder
     {
         $container = new ContainerBuilder();