Add generated miner OpenAPI docs

[abulasa1]

Summary

Adds a generated OpenAPI 3.1 reference for the miner HTTP API.

Changes

• Add scripts/generate_miner_openapi.py to statically extract app.router.add_* routes from neurons/miner.py
• Add generated docs/miner-openapi.json
• Add docs/miner-api.html Redoc viewer
• Document the generation/check commands in docs/miner.md
• Add tests that compare the generated OpenAPI paths against the aiohttp route table

Auth Coverage

The spec documents the two auth patterns currently used by miner endpoints:

• Signed request-body fields: hotkey, nonce, signature
• Namespace ownership fields: namespace_hotkey, namespace_sig, namespace_timestamp_ms

Validation

Static validation performed locally:

• Parsed docs/miner-openapi.json as JSON
• Confirmed OpenAPI version is 3.1.0
• Confirmed 26 OpenAPI operations match the 26 neurons/miner.py aiohttp route registrations
• Confirmed SignedBody and NamespaceSignature security scheme entries are present

I could not run pytest in this environment because the available python.exe is the Windows Store placeholder rather than a working Python runtime.

Closes #23

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