feat: add owner_open_id config and auto-grant permission after doc creation

[ilittle7]

Summary

• Add owner_open_id config field as an alternative to owner_email for granting document permissions after creation
• owner_open_id takes priority over owner_email when both are configured
• Auto-grant full_access permission after doc create, bitable create, file mkdir, file copy, and doc import-file
• Auto-transfer ownership when transfer_ownership: true is set

Motivation

Personal Feishu accounts that registered with a phone number (without enterprise email) cannot use email-based permission APIs — the API returns Invalid parameter (code 1063001). Using openid as the member type works for all accounts.

Config

# Priority: owner_open_id > owner_email
owner_open_id: "ou_xxxx"          # env: FEISHU_OWNER_OPEN_ID
owner_email: "user@example.com"   # env: FEISHU_OWNER_EMAIL (fallback)
transfer_ownership: true          # optional: transfer doc ownership to owner

Changes

File	Change
internal/config/config.go	Add OwnerOpenID field, GetOwner() method, env binding, default template
internal/config/config_test.go	Tests for new field, env var, GetOwner() priority logic
cmd/owner_grant.go	New grantOwnerPermission() helper function
cmd/create_document.go	Call grantOwnerPermission after doc create
cmd/bitable_create.go	Call grantOwnerPermission after bitable create
cmd/import_file.go	Call grantOwnerPermission after file import
cmd/copy_file.go	Call grantOwnerPermission after file copy
cmd/create_folder.go	Call grantOwnerPermission after folder create
cmd/config_get.go	Add owner_open_id to help text

Test plan

• All existing tests pass (go test ./...)
• New tests for OwnerOpenID from env var
• New tests for OwnerOpenID from config file
• New tests for GetOwner() priority (open_id > email > none)
• Manual test: create doc with owner_open_id configured

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