Fix: PSI-10 mirrored twice when multi-fund mode is enabled

[mpont91]

With hft.multi-fund.enabled: true (the default in both application-develop.yaml and application-production.yaml), startup logs:

INFO  MultiFundConfiguration : Initializing fund: PSI-10 with $15000.00 capital (15.0%)
ERROR MultiFundConfiguration : Failed to initialize fund PSI-10: Fund already registered: PSI-10
java.lang.IllegalStateException: Fund already registered: PSI-10
    at FundRegistry.registerFund(FundRegistry.java:29)
    at MultiFundConfiguration.initializeFunds(MultiFundConfiguration.java:98)

FundConfiguration is active on hft.fund.enabled=true and registers hft.fund.index-type (PSI-10) with hft.fund.capital-usd. MultiFundConfiguration then registers the same id with its allocation, and FundRegistry.registerFund rejects the duplicate.

Why it matters beyond the log line

MultiFundConfiguration catches only IllegalArgumentException around that call, so the IllegalStateException escapes to the outer handler and PSI-10 logs as failed — Successfully initialized PSI mirror fund: PSI-10 never prints.

But FundConfiguration does not just register: it also builds a FundPositionMirror, a FundTradeListener, a FundTradePoller on a 1s schedule and a FundSignalProcessor on a 100ms schedule, all for the same index. Those keep running. So PSI-10 is mirrored by two independent pipelines at once, and the registry reports hft.fund.capital-usd ($10,000 by default) rather than the multi-fund allocation ($15,000 at 15% of 100k) that the mirror actually sizes with.

Fix

The FundRegistry bean stays unconditional — multi-fund depends on it. Its single-fund registration returns early when multi-fund mode is on, and the two legacy schedulers are gated with @ConditionalOnProperty(prefix = "hft.multi-fund", name = "enabled", havingValue = "false", matchIfMissing = true), so single-fund deployments are unchanged.

After

INFO FundConfiguration     : Multi-fund mode is on; skipping single-fund registration of PSI-10
INFO FundRegistry          : Registered fund: PSI-10 (PSI-10) with $15000.00 capital
INFO MultiFundConfiguration: Successfully initialized PSI mirror fund: PSI-10