feat: add cross-database entity lookup for searching column values across all databases

Enables searching for a specific column value (e.g. carrier_id=123) across all databases on a PostgreSQL server. The backend creates temporary connection pools per database (semaphore-limited to 5), queries information_schema for matching columns, and executes read-only SELECTs with real-time progress events. Results are grouped by database/table in a new "Entity Lookup" tab.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/lib/tauri.ts

@@ -1,4 +1,5 @@
 import { invoke } from "@tauri-apps/api/core";
+import { listen, type UnlistenFn } from "@tauri-apps/api/event";
 import type {
   ConnectionConfig,
   QueryResult,
@@ -19,6 +20,10 @@ import type {
   TablePrivilege,
   GrantRevokeParams,
   RoleMembershipParams,
+  AiSettings,
+  OllamaModel,
+  EntityLookupResult,
+  LookupProgress,
 } from "@/types";
 
 // Connections
@@ -230,3 +235,37 @@ export const cancelQuery = (connectionId: string, pid: number) =>
 
 export const terminateBackend = (connectionId: string, pid: number) =>
   invoke<boolean>("terminate_backend", { connectionId, pid });
+
+// AI
+export const getAiSettings = () =>
+  invoke<AiSettings>("get_ai_settings");
+
+export const saveAiSettings = (settings: AiSettings) =>
+  invoke<void>("save_ai_settings", { settings });
+
+export const listOllamaModels = (ollamaUrl: string) =>
+  invoke<OllamaModel[]>("list_ollama_models", { ollamaUrl });
+
+export const generateSql = (connectionId: string, prompt: string) =>
+  invoke<string>("generate_sql", { connectionId, prompt });
+
+// Entity Lookup
+export const entityLookup = (
+  config: ConnectionConfig,
+  columnName: string,
+  value: string,
+  lookupId: string,
+  databases?: string[]
+) =>
+  invoke<EntityLookupResult>("entity_lookup", {
+    config,
+    columnName,
+    value,
+    lookupId,
+    databases,
+  });
+
+export const onLookupProgress = (
+  callback: (p: LookupProgress) => void
+): Promise<UnlistenFn> =>
+  listen<LookupProgress>("lookup-progress", (e) => callback(e.payload));