SMOODEV-2029: OTLP export over smooai-fetch — drop raw reqwest from the Rust SDK

[brentrager]

Routes OTLP trace+metric export through smooai-fetch via a smooai-fetch-backed opentelemetry_http::HttpClient adapter (auth-injection + 401-retry preserved). The Rust SDK's ENTIRE outbound HTTP — M2M token exchange, webhook transport, and OTLP export — now goes through smooai-fetch; raw reqwest is , pulled only by the reqwest-middleware integration feature (the client-span middleware FOR reqwest users). Double-retry avoided: opentelemetry-otlp's experimental-http-retry is OFF, smooai-fetch owns transport retry/backoff/circuit-breaking. fmt+clippy(--all-features)+test green; no-feature + reqwest-middleware builds clean. SMOODEV-2029 / epic 1981.

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