Port upstream 0.64.1: honor saved Kimi API region in CLI and serve fetch contexts

[Finesssee]

Port upstream 0.64.1 Kimi CLI region parity (steipete#3712 follow-up, GAP-28):

• Saved per-provider API region now reaches every fetch context: codexbar usage CLI runs, serve /usage responses, and dashboard snapshot fetches populate FetchContext.api_region from provider settings via the new populate_api_region_from_settings helper (explicit context values keep precedence; empty/unset regions leave the context untouched).
• Claude token-account rows build their fetch context up front and also get the saved region, so per-account overrides no longer reset region selection.
• New module rust/src/cli/fetch_context.rs (declared in cli/mod.rs) owns the helper plus unit tests covering: saved international region populates the context, empty/unset leaves it missing, an explicit caller value wins, and KimiRegion::from_settings("international") selects the api.kimi.ai / www.kimi.ai domains.

Validation (at a6ba165 + lint companion cf4bac8, toolchain clippy 1.96):

• cargo fmt --all — pass.
• cargo test --manifest-path rust/Cargo.toml — full suite pass, 0 failed / 1 ignored (includes the four new fetch-context region tests).
• cargo clippy --manifest-path rust/Cargo.toml --all-targets -- -D warnings — pass. The companion commit fixes three pre-existing lint sites (alibabatokenplan manual_range_contains, kiro + openai nonminimal_bool) that clippy 1.96 flags identically on origin/main; no behavior change.
• Pushed port/micro-0.64.1-kimi-cli-region cf4bac8. CLI/serve fetch-context wiring only; dashboard frontend untouched — browser-use UI proof not applicable.

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[Finesssee]

Validated 2026-10-01 at cf4bac8 (port content) + a6ba165 (feature commit):

• cargo fmt --all — pass.
• cargo test --manifest-path rust/Cargo.toml — full workspace suite pass, 0 failed / 1 ignored; includes the four new fetch-context region tests (saved international region populates, empty/unset leaves missing, explicit caller value wins, KimiRegion::International → api.kimi.ai / www.kimi.ai domains) and the CLI/serve/dashboard region-population wiring.
• cargo clippy --manifest-path rust/Cargo.toml --all-targets -- -D warnings — pass. Companion commit cf4bac8 fixes three pre-existing lint sites (alibabatokenplan manual_range_contains, kiro + openai nonminimal_bool) that the local clippy 1.96 flags identically on origin/main — no behavior change.
• Pushed port/micro-0.64.1-kimi-cli-region (new branch); ls-remote head matches local cf4bac89.
• CLI/serve fetch-context wiring only; dashboard frontend untouched — no browser-use UI proof applicable.