feat: asa max conversions and loc invoicing flags

[adressop6789-max]

Why

• ASA-767. Max Conversions campaigns created through the CLI stayed NOT_RUNNING with AUTOMATED_KEYWORDS_REQUIRED_AD_GROUP_MISSING: Apple requires an automated ad group (automatedKeywordsRequired=true, no start_time), and the CLI could neither send that field nor omit the default start time.
• ASA-768. Line-of-credit organizations (payment_model: LOC) must fill Invoicing Options on every campaign, otherwise Apple parks it with MISSING_BO_OR_INVOICING_FIELDS. The CLI had no way to pass loc_invoice_details.
• The CLI never surfaced serving_status / serving_state_reasons, so users only saw "not spending".

Backend contract: feature/ASA-767-cli-mc-loc in asa-analytics (not deployed yet).

What

• asa ad-groups create --automated — sends automated_keywords_required: true, automated_keywords_opt_in: true, no start_time, no default_bid_amount unless --default-bid is given. --default-bid is now required only without --automated; --automated --start-time exits 2 before the network.
• asa campaigns create|update — five Invoicing Options flags (--invoice-advertiser, --invoice-order-number, --invoice-contact-name, --invoice-contact-email, --invoice-billing-email) → loc_invoice_details. All five or none; a partial set exits 2 before the network.
• After a campaign mutation, NOT_RUNNING + serving_state_reasons are printed with the fixing command for the two reasons above (stdout only, --json stays a clean result).
• Schemas: serving_status, serving_state_reasons, payment_model, loc_invoice_details, automated_keywords_required on the matching DTOs.
• Docs (docs/agent/asa-management.md, skill references, README): Max Conversions and Line of credit sections, payment_model on asa orgs list.

Checks

• pnpm build, eslint src test — clean
• mocha — 174 passing (5 new tests in asa-writes.test.ts)
• node scripts/check-agent-docs.mjs — docs match the manifest