Feature/api config and tests hardening

[favourawaku]

Summary

Hardens the API with configurable bind address, reduces default logging noise via TraceLayer config, adds testnet contract ID stability warning to
docs, and introduces test coverage for dividend sort order edge cases.

Changes

#117 — Configurable bind address

• Read BIND_ADDR env var with 0.0.0.0 default, allowing operators to restrict the bind interface behind a proxy

#118 — TraceLayer logging reduction

• Configure TraceLayer spans and responses at DEBUG level to avoid default INFO noise under load

#119 — Testnet contract ID warning

• Add callout warning that contract IDs are examples and drift after redeploy

#120 — Dividends sort order test

• Test verifies DESC sort by created_at_ledger and claimed_percent clamping when distributed > total

Closes #117, Closes #118, Closes #119, Closes #120

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