Use core v0.60.0: auxiliary requests are answered locally or forwarded

[fylorn]

Why

Core v0.60.0 (ThinkWatch-Core#281) gives client helper requests two modes instead of three. "Pass through" and "Use routing" both went through the routing rules and differed only in whether a rule's auxiliary-request condition could match, while the names and the dry run suggested that "Pass through" skipped routing. They are now one mode, "Forward": a forwarded helper request carries its class, so a rule's auxiliary-request condition takes effect as soon as it is written.

What

• Auxiliary tab: two-way segmented control (Answer locally / Forward). The forward row says the request follows the routing rules; the footer says rules can match forwarded kinds with the auxiliary-request condition.
• Rule dialog: the "set these categories to be routed on save" checkbox is gone. A warning names the classes the condition picks that are answered locally (they never reach routing) and points to the Auxiliary tab. It is not shown when "any auxiliary request" is chosen, since that means any forwarded kind.
• Route dialog: no longer sends route_probes (removed from RouteSave).
• Dry run: the pass-through outcome is gone; only locally answered requests short-circuit.
• Pin core v0.60.0 (protocol 36, schema unchanged at 25); regenerate tw-api.ts; update fixtures, shot data and core.zh.json (control.unknown_probe_class removed).

Upgrade note

A config.yaml that sets client_probes.<class> to passthrough or route does not load in core 0.60.0 (safe mode). Configs that never changed the Auxiliary tab are unaffected. Agreed to cover this in the release notes only, without a compatibility path.

Tests

• pnpm typecheck, pnpm test (744 passed)
• cargo fmt --check, cargo clippy --all-targets -D warnings, cargo test with a twcore built at v0.60.0 (all passed, including control_plane handshake tests)
• Preview harness: Auxiliary tab in zh and en; the rule dialog warning with an intercepted class, hidden with "any auxiliary request"

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