Order perf: SDK output-vault filter + quote timing

[alastairong1]

Summary

• Set quote batch chunk_size to 4 to avoid exceeding public RPC eth_call gas limits.
• Add stage timing (orders, quotes, total) to structured logs for order list performance monitoring.
• Delegate output-vault balance filtering to Raindex via has_positive_output_vault_balance: Some(true) before quote fetching.
• Remove REST-side formatted balance parsing and local zero-balance quote filtering.
• Update REST compatibility for the newer Raindex bindings, take-order candidate signature, signed context field, and spec version 5 test fixtures.

Depends On

• feat: add positive output vault balance order filter rainlanguage/raindex#2562 (feat: add positive output vault balance order filter)
• This stack bumps lib/rain.orderbook to 014016c699a2da4aa27d335bbf565e7347c2f762, which exposes has_positive_output_vault_balance.

Stack

• Base branch: alastair/nginx-hardening (Nginx hardening + infra updates #87)
• Head branch: alastair/order-perf-optimizations

Test plan

• nix develop -c cargo check
• nix develop -c cargo test routes::orders
• nix develop -c cargo test
• nix develop -c rainix-rs-static fails on existing clippy too_many_arguments errors in src/routes/trades.rs route handlers.

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• Cargo.lock is excluded by !**/*.lock

📒 Files selected for processing (7)

• lib/rain.orderbook
• src/routes/orders/get_by_owner.rs
• src/routes/orders/get_by_token.rs
• src/routes/orders/mod.rs
• src/routes/swap/mod.rs
• src/routes/tokens.rs
• src/test_helpers.rs

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• Create PR with unit tests
• Commit unit tests in branch alastair/order-perf-optimizations

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[findolor]

• Order perf: SDK output-vault filter + quote timing #88 👈 (View in Graphite)
• main

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[findolor]

I think the change in this PR belongs in the SDK level since processing the zero balance output vaults for an order doesn't make sense during quoting. We should keep the API simple without any custom logic.

So with that said I will open up a PR in raindex repo that handles this and we can bump raindex submodule here. Then we can remove the filtering logic

took over this PR myself