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pgamdirect: convert to TypeScript, use ortbConverter

Addresses patmmccann review on #14763:
  - Convert pgamdirectBidAdapter.js → .ts with typed public interface.
  - Replace the hand-rolled imp/device/user/source builders with
    libraries/ortbConverter, keeping only the pgam-specific fields
    (imp.ext.pgam.orgId, imp.tagid from params.placementId,
    meta.networkName from seatbid.seat) as converter hooks.
  - Drop the contentType: 'application/json' header entirely — JSON
    is NOT a CORS-simple content-type, so setting it forces a
    browser preflight on every auction. Omitting it keeps the POST
    preflight-free (saves one RTT per request).

The converter inherits Prebid's standard handling of:
  - priceFloors module (imp.bidfloor / bidfloorcur via bid.getFloor)
  - schain via FPD normalisation (source.ext.schain)
  - source.tid, user.eids, site/device/regs (GDPR, USP, GPP, COPPA)
  - media types (banner sizes → format[], video player size passthrough,
    native request serialisation)
  - bidResponse cpm/currency/ttl/netRevenue/mediaType/advertiserDomains

So this change:
  - Removes ~200 lines of custom plumbing.
  - Means future ORTB spec updates (2.7, new privacy fields) flow
    through automatically when Prebid updates the converter.

Also:
  - Register GVL ID 1353 on spec (PGAM Media LLC, registered with IAB).
  - Keep params.bidfloor as a legacy fallback when the priceFloors
    module has not populated imp.bidfloor.
  - Force at=1 (first-price) and cur=['USD'] via a request hook.

Spec tests: trimmed to cover only the adapter-owned behaviour
(isBidRequestValid, CORS-simple options, imp hook custom fields,
request hook, bidResponse.meta.networkName, onBidWon). Library-owned
behaviour (floors / schain / GDPR / media types / VAST parsing) is
not re-asserted here; those are covered by ortbConverter's own specs
and by every other adapter that uses it. 26/26 pass locally.