docs-sync v3.0.1: WS page, error codes, public /rpc/evm route, x-batch-ids fix

[maia-cloud-agent]

This pull request updates the documentation to align with RouteMesh v3.0.1 and includes the following changes:

New Public RPC Endpoint Documentation

• Added documentation for a new public JSON-RPC proxy endpoint (POST /rpc/evm/{chainId}) that allows anonymous access without an API key, subject to per-IP rate limits
• Added example in the quick-start guide showing how to make requests to this public route
• Documented the rate limits and guidance to sign up for a free account when limits are hit

New WebSocket API Documentation

• Added a new "WebSocket API" section documenting real-time event streaming support
• Covers connection setup using wss://lb.routeme.sh/rpc/{chain_id}/{api_key}
• Documents the eth_subscribe/eth_unsubscribe protocol with code examples
• Lists handshake failure scenarios and their HTTP status codes (402, 429, 503, 401)
• Provides details on supported subscription types, pricing, and reliability features including seamless failover and gap backfill

Expanded RPC Error Code Reference

• Added 10 new error codes to the documentation:
  • -32601: Insufficient credits
  • -32007: No block-param capable nodes
  • -32008: No providers available
  • -32009: All nodes failed
  • -32011: No opcode-capable nodes
  • -32012: Insufficient historical state depth
  • -32013: No single provider satisfies all constraints
  • -32029: Public rate limited
  • -32030: Public capacity exhausted
• Updated descriptions for existing error codes (e.g., -32602 now also covers overly large responses)

Bug Fix: X-Batch-Id Documentation

• Corrected the documentation for batch requests: instead of one X-Batch-Id for the entire batch, there's now one X-Batch-Ids header containing comma-separated batch IDs for each item in the batch

[kodus-routemesh-hosted]

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[diff-guardian]

Diff Guardian — addressing summary

Addressed

• intro/rpc-error-codes.mdx — corrected -32601 description to state it is the JSON-RPC 2.0 "Method not found" code, repurposed here to signal an empty credit balance (commit 0aa6666).

Tests

• npx mintlify validate — passed
• npx mintlify broken-links — passed (no broken links)