feat: add adapter picker for imported agents

When importing a company, users can now choose the adapter type for each
imported agent. Defaults to the current company CEO's adapter type (or
claude_local if none). Includes an expandable "configure adapter" section
per agent that renders the adapter-specific config fields.

- Added adapterOverrides to import request schema and types
- Built AdapterPickerList UI component in CompanyImport.tsx
- Backend applies adapter overrides when creating/updating agents

Co-Authored-By: Paperclip <noreply@paperclip.ing>

packages/shared/src/validators/company-portability.ts

@@ -169,6 +169,13 @@ export const companyPortabilityPreviewSchema = z.object({
 
 export type CompanyPortabilityPreview = z.infer<typeof companyPortabilityPreviewSchema>;
 
-export const companyPortabilityImportSchema = companyPortabilityPreviewSchema;
+export const portabilityAdapterOverrideSchema = z.object({
+  adapterType: z.string().min(1),
+  adapterConfig: z.record(z.unknown()).optional(),
+});
+
+export const companyPortabilityImportSchema = companyPortabilityPreviewSchema.extend({
+  adapterOverrides: z.record(z.string().min(1), portabilityAdapterOverrideSchema).optional(),
+});
 
 export type CompanyPortabilityImport = z.infer<typeof companyPortabilityImportSchema>;