[Bug]: Firecrawl self-hosted returns non-absolute URLs, causing "Invalid URL" errors in agents repo

[Bergdis]

What happened?
When self-hosting Firecrawl and integrating with the agents repo, the API sometimes returns non-absolute URLs (e.g., /frontpage/). This causes downstream errors in LibreChat/agents, such as:

Error parsing URL: TypeError: Invalid URL
at new URL (node:internal/url:825:25)
...
code: 'ERR_INVALID_URL',
input: '/frontpage/'

Version Information
danny-avila/LibreChat@7742b18

Steps to Reproduce
Deploy Firecrawl self-hosted (Azure Container Apps, Docker Compose, etc.).
Use the agents repo to process crawl results.
Observe errors when the API returns relative URLs.
What browsers are you seeing the problem on?
Microsoft Edge

Relevant log output
at formatSource (/workspaces/AdvancedChat/node_modules/@librechat/agents/dist/cjs/tools/search/format.cjs:36:10)
at Object.formatResultsForLLM (/workspaces/AdvancedChat/node_modules/@librechat/agents/dist/cjs/tools/search/format.cjs:108:30)
at tools.tool.name (/workspaces/AdvancedChat/node_modules/@librechat/agents/dist/cjs/tools/search/tool.cjs:199:47)
at process.processTicksAndRejections (node:internal/process/task_queues:105:5)
at async DynamicStructuredTool.call (/workspaces/AdvancedChat/node_modules/@langchain/core/dist/tools/index.cjs:156:22)
at async /workspaces/AdvancedChat/node_modules/@librechat/agents/dist/cjs/tools/ToolNode.cjs:58:32 {
code: 'ERR_INVALID_URL',
input: '/'
}
Error parsing URL: TypeError: Invalid URL
at new URL (node:internal/url:825:25)
at Object.getDomainName (/workspaces/AdvancedChat/node_modules/@librechat/agents/dist/cjs/tools/search/utils.cjs:28:24)
at /workspaces/AdvancedChat/node_modules/@librechat/agents/dist/cjs/tools/search/format.cjs:60:40
at Array.forEach ()
at formatSource (/workspaces/AdvancedChat/node_modules/@librechat/agents/dist/cjs/tools/search/format.cjs:36:10)
at Object.formatResultsForLLM (/workspaces/AdvancedChat/node_modules/@librechat/agents/dist/cjs/tools/search/format.cjs:108:30)
at tools.tool.name (/workspaces/AdvancedChat/node_modules/@librechat/agents/dist/cjs/tools/search/tool.cjs:199:47)
at process.processTicksAndRejections (node:internal/process/task_queues:105:5)
at async DynamicStructuredTool.call (/workspaces/AdvancedChat/node_modules/@langchain/core/dist/tools/index.cjs:156:22)
at async /workspaces/AdvancedChat/node_modules/@librechat/agents/dist/cjs/tools/ToolNode.cjs:58:32 {
code: 'ERR_INVALID_URL',
input: '#'
}
Error parsing URL: TypeError: Invalid URL
at new URL (node:internal/url:825:25)
at Object.getDomainName (/workspaces/AdvancedChat/node_modules/@librechat/agents/dist/cjs/tools/search/utils.cjs:28:24)
at /workspaces/AdvancedChat/node_modules/@librechat/agents/dist/cjs/tools/search/format.cjs:60:40
at Array.forEach ()
at formatSource (/workspaces/AdvancedChat/node_modules/@librechat/agents/dist/cjs/tools/search/format.cjs:36:10)
at Object.formatResultsForLLM (/workspaces/AdvancedChat/node_modules/@librechat/agents/dist/cjs/tools/search/format.cjs:108:30)
at tools.tool.name (/workspaces/AdvancedChat/node_modules/@librechat/agents/dist/cjs/tools/search/tool.cjs:199:47)
at process.processTicksAndRejections (node:internal/process/task_queues:105:5)
at async DynamicStructuredTool.call (/workspaces/AdvancedChat/node_modules/@langchain/core/dist/tools/index.cjs:156:22)
at async /workspaces/AdvancedChat/node_modules/@librechat/agents/dist/cjs/tools/ToolNode.cjs:58:32 {
code: 'ERR_INVALID_URL',
input: '#'
}