IP address fields missing from fieldTypeMap

Problem

Quickwit's _field_caps endpoint reports IP address fields as type ip (see field_capability.rs FieldCapabilityEntryType::Ip), but the plugin's fieldTypeMap in src/utils/index.ts does not include an ip entry. This means:

1. IP fields get type: undefined when mapped through fieldTypeMap
2. They are excluded from type-filtered field pickers
3. They may not appear in autocomplete suggestions

Scope

Not present in the OTEL log index currently, but quickwit supports IpAddr fields and the _field_caps mapping exists. Any index using IP fields would be affected.

Fix

Add ip to fieldTypeMap:

export const fieldTypeMap: Record<string, string> = {
  // ... existing entries ...
  ip: 'ip',
};

May also need filter/query handling for IP-specific syntax (CIDR ranges, etc.).

Start in src/utils/index.ts and inspect fieldTypeMap, then compare its entries with the IP type reported by field_capability.rs. Add the missing mapping and check the type-filtered field pickers and autocomplete paths; done means IP fields are mapped instead of undefined and are included where appropriate.