fix: make excludeRouters configurable instead of hardcoded

[happy-edge]

Summary

When excludeDexes is specified, the plugin previously added a hardcoded list of excludeRouters without any way to override or opt out. This PR makes the behavior configurable.

Problem

// Before: User has no control over router exclusions
init({
  formProps: {
    excludeDexes: ['Raydium'], // Always adds hardcoded excludeRouters
  }
});

Solution

// After: User has full control
init({
  formProps: {
    excludeDexes: ['Raydium'],
    excludeRouters: ['okx'], // Override defaults
  }
});

// Or opt out of default router exclusions
init({
  formProps: {
    excludeDexes: ['Raydium'],
    excludeRouters: [], // Empty array = no router exclusions
  }
});

Changes

• types/index.d.ts: Add excludeRouters to FormProps with JSDoc
• SwapContext.tsx: Pass excludeRouters to quote query
• useQuoteQuery.ts:
  • Only apply default excludeRouters if user doesn't specify their own
  • Extract defaults to DEFAULT_EXCLUDED_ROUTERS constant
  • Also includes fixes from PR fix: cleanup useQuoteQuery and remove stray console.log #217 (typo, unused import)

Backwards Compatible

Existing integrations work identically - the default behavior is preserved when excludeRouters is not specified.

[vercel]

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[thejesh23]

Clean change. Two small things:

1. Opt-out semantics are subtle. excludeRouters: undefined → defaults applied; excludeRouters: [] → no defaults. That's a defensible convention but not obvious from the type signature. Worth calling out in the JSDoc explicitly, e.g. "Pass [] to disable the default router exclusions." Otherwise integrators will guess.

2. keepPreviousData import was removed along with the unrelated typo fix. Worth double-checking it isn't referenced elsewhere in useQuoteQuery.ts outside the diff window — if it was passed to useQuery's placeholderData option below the visible range, the build will break. (Unrelated to the main change either way; consider splitting cosmetic cleanups out, especially since the description already notes this overlaps with #217.)