v0.3.0

Changes

• Connection pooling: Reuse shared httpx.AsyncClient instead of creating one per request
• Basic Auth: Credentials sent via HTTP header instead of query params
• Retry with backoff: Automatic retry (2x) on transient network errors
• Configurable timeout: New INFLUXDB_TIMEOUT env var (default: 30s)
• Updated repo references: Renamed to mcp-influx1