feat(ads-client): add OHTTP support (AC-94)#7315
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Add per-request OHTTP support via the `ohttp` flag on `MozAdsRequestOptions` and `MozAdsCallbackOptions`. When enabled, individual MARS requests are routed through viaduct's OHTTP layer with automatic preflight for geo/user-agent override headers. - Add `ohttp: bool` parameter to fetch_ads, record_click, record_impression, report_ad and all public API methods - Add `MozAdsCallbackOptions` FFI type for callback OHTTP support - Add `mars/preflight.rs` with PreflightRequest/PreflightResponse types - Preflight responses cached via HttpCache (CacheFirst with default TTL) - Add `FetchAdsError::Preflight` variant for preflight failures - Add OHTTP integration test against prod - Update usage docs for all platforms (JavaScript, Kotlin, Swift)
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Summary
ohttp: boolfield toMozAdsRequestOptionsand newMozAdsCallbackOptions { ohttp: bool }to opt individual requests into OHTTP routingrequest_tile_ads,request_image_ads,request_spoc_ads,record_impression,record_click,report_adoptionsparameters use UniFFI defaults so existing callers require no changesOHTTP_CHANNEL_IDfromhttp_cacheintoclient— http_cache is now generic and has no ads-client knowledge#[uniffi(default = None/false)]to optional fields acrossMozAdsPlacementRequest,MozAdsCacheConfig,MozAdsRequestCachePolicyfor better ergonomics in consumer codedocs/usage.mdinto per-language files (usage-javascript.md,usage-kotlin.md,usage-swift.md) with correct language-specific examplesviaduct'sohttpfeature depends on NSS)test_contract_tile_ohttp_prodagainst production MARS over OHTTPPull Request checklist
[ci full]to the PR title.