Port Nous Portal subscription credits

[Finesssee]

Summary

• Add the Nous Portal subscription provider from upstream 0.61.0.
• Read Hermes Agent credentials from the configured profile without refreshing or writing them; support NOUS_PORTAL_ACCESS_TOKEN as an explicit environment override.
• Enforce HTTPS and trusted nousresearch.com routing for stored portal origins.
• Parse monthly subscription, rollover, purchased, and total usable credits with renewal and account identity details.
• Register Nous across the Rust provider catalog, factory, CLI aliases, OAuth source policy, tray/dashboard catalogs, and provider icons.
• Bound streamed portal responses incrementally so oversized chunked responses cannot be buffered without a limit.

Validation

• cargo test --manifest-path rust/Cargo.toml nous -- --nocapture — 11 passed
• cargo test --manifest-path rust/Cargo.toml --lib --quiet — 1,937 passed, 1 ignored
• cargo test --manifest-path apps/desktop-tauri/src-tauri/Cargo.toml commands::tests --quiet — 94 passed
• cargo clippy --manifest-path rust/Cargo.toml --all-targets -- -D warnings — passed
• cargo clippy --manifest-path apps/desktop-tauri/src-tauri/Cargo.toml --all-targets -- -D warnings — passed
• cargo fmt --all and git diff --check — passed

Frontend Vitest and fresh Tauri UI/CUA proof were not run because this checkout has no apps/desktop-tauri/node_modules; installing dependencies would consume the storage budget during the port batch. Hosted CI should provide the frontend validation.

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