fix: use ST0x registry fallback in prod

[findolor]

Motivation

Prod currently needs a fallback registry that can initialize the deployed raindex client when no private registry artifact is available. The previous fallback points at the public rain.strategies registry, which failed to initialize during recovery.

Solution

Update the prod fallback registry URL to the ST0x registry commit that was verified during recovery:

https://raw.githubusercontent.com/ST0x-Technology/st0x.registry/e1fa474d45f126d70cdf2d3acd893e15c836ef03/registry

Checks

• nix develop -c cargo fmt
• nix develop -c rainix-rs-static

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Summary by CodeRabbit

• Chores
  • Updated registry configuration to reference a new endpoint with pinned commit hash for improved version control and consistency.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 54f6ed47-1f04-4737-9571-ab957d1445ed

📥 Commits

Reviewing files that changed from the base of the PR and between ebb328b and 7d9c356.

📒 Files selected for processing (1)

• config/prod.toml

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📝 Walkthrough

Walkthrough

The production configuration registry URL is updated to point to the ST0x-Technology/st0x.registry repository, pinned to a specific commit hash for reproducible builds.

Changes

Registry Configuration Update

Layer / File(s)	Summary
Registry URL configuration config/prod.toml	Production registry URL is changed to reference ST0x-Technology/st0x.registry at a pinned commit hash.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

A registry renewed with a commit so fine,
Pinned tight to ensure the deployments align,
The rabbit declares with a hop and a cheer,
That stability comes when the versions are clear! 🐰

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: updating the production registry URL to use the ST0x registry fallback, which directly addresses the PR's core objective.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/prod-st0x-registry-fallback

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[blacksmith-sh]

Blacksmith runners detected OOM events on the following jobs:

Job	Details
rust test 3 of 4	View Job