fix: replace hardcoded Koios URLs with public endpoints + koios.url config override

[wcatz]

Problem

Two separate bugs:

1. Private endpoint in production code — all REST-based Koios calls (nonce fetch, pool history, epoch info, pool blocks, pool registration) hardcoded koios.tosidrop.me as the mainnet base URL. That's a private mirror, not a public default.

2. Inconsistency between code paths — the Go client (i.koios) used api.koios.rest (public), while the raw REST helpers used tosidrop (private). Same logical operation, different backends.

3. Tests hardcoded api.koios.rest directly, bypassing any config logic.

Fix

• koiosRESTBase(networkMagic int): defaults to public koios.rest per network; reads koios.url config override first
• koiosClientHost(networkMagic int): same logic for the Go client (returns just the hostname)
• Both Koios code paths (Go client + raw REST) now route through the same config-aware helpers
• cli.go Go client init simplified from 3-branch switch to one line
• Tests use koiosRESTBase(MainnetNetworkMagic) instead of hardcoded strings
• config.yaml.example: documents koios.url optional override
• All tosidrop references removed from code, docs, and agent skill files

Default endpoints (no config override)

Network	URL
Mainnet	https://api.koios.rest/api/v1
Preprod	https://preprod.koios.rest/api/v1
Preview	https://preview.koios.rest/api/v1

Config override (optional)

koios:
  url: "https://your-private-mirror.example.com/api/v1"

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⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 4934760a-9f73-45f1-8934-621aff627704

📥 Commits

Reviewing files that changed from the base of the PR and between e5a8da2 and 16204f5.

📒 Files selected for processing (8)

• .omp/SYSTEM.md
• .omp/skills/history-debug/SKILL.md
• .omp/skills/verify-nonces/SKILL.md
• cli.go
• comprehensive_test.go
• config.yaml.example
• main.go
• nonce_koios_test.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/koios-url-config

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