[Agent] Add README files for all bridge tools

Add README.md files for Brave, Firecrawl, Mapbox, OpenMeteo, SerpApi, and Tavily bridge tools to provide consistent documentation and resource links.

Author: OskarStark

src/agent/src/Bridge/Brave/README.md

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+Brave Search AI Tool
+====================
+
+Provides [Brave Search](https://brave.com/search/api/) integration for Symfony AI Agent.
+
+Resources
+---------
+
+ * [Contributing](https://symfony.com/doc/current/contributing/index.html)
+ * [Report issues](https://github.com/symfony/ai/issues) and
+   [send Pull Requests](https://github.com/symfony/ai/pulls)
+   in the [main Symfony AI repository](https://github.com/symfony/ai)

src/agent/src/Bridge/Firecrawl/README.md

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+Firecrawl AI Tool
+=================
+
+Provides [Firecrawl](https://www.firecrawl.dev/) integration for Symfony AI Agent.
+
+Resources
+---------
+
+ * [Contributing](https://symfony.com/doc/current/contributing/index.html)
+ * [Report issues](https://github.com/symfony/ai/issues) and
+   [send Pull Requests](https://github.com/symfony/ai/pulls)
+   in the [main Symfony AI repository](https://github.com/symfony/ai)

src/agent/src/Bridge/Mapbox/README.md

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+Mapbox AI Tool
+==============
+
+Provides [Mapbox](https://www.mapbox.com/) integration for Symfony AI Agent.
+
+Resources
+---------
+
+ * [Contributing](https://symfony.com/doc/current/contributing/index.html)
+ * [Report issues](https://github.com/symfony/ai/issues) and
+   [send Pull Requests](https://github.com/symfony/ai/pulls)
+   in the [main Symfony AI repository](https://github.com/symfony/ai)

src/agent/src/Bridge/OpenMeteo/README.md

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+OpenMeteo AI Tool
+=================
+
+Provides [OpenMeteo](https://openmeteo.com/) integration for Symfony AI Agent.
+
+Resources
+---------
+
+ * [Contributing](https://symfony.com/doc/current/contributing/index.html)
+ * [Report issues](https://github.com/symfony/ai/issues) and
+   [send Pull Requests](https://github.com/symfony/ai/pulls)
+   in the [main Symfony AI repository](https://github.com/symfony/ai)

src/agent/src/Bridge/SerpApi/README.md

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+SerpApi AI Tool
+===============
+
+Provides [SerpApi](https://serpapi.com/) integration for Symfony AI Agent.
+
+Resources
+---------
+
+ * [Contributing](https://symfony.com/doc/current/contributing/index.html)
+ * [Report issues](https://github.com/symfony/ai/issues) and
+   [send Pull Requests](https://github.com/symfony/ai/pulls)
+   in the [main Symfony AI repository](https://github.com/symfony/ai)

src/agent/src/Bridge/Tavily/README.md

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+Tavily AI Tool
+==============
+
+Provides [Tavily](https://tavily.com/) integration for Symfony AI Agent.
+
+Resources
+---------
+
+ * [Contributing](https://symfony.com/doc/current/contributing/index.html)
+ * [Report issues](https://github.com/symfony/ai/issues) and
+   [send Pull Requests](https://github.com/symfony/ai/pulls)
+   in the [main Symfony AI repository](https://github.com/symfony/ai)