chore: rebrand plugin from Silo to Prairie

[JonahMMay]

Summary

Rebrands this first-party plugin to Prairie module paths, plugin IDs, manifest fields, docs, and CI.

Test plan

• go test ./...

  

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: a61ede03-b62a-49c2-b04b-1d636dd29cc4

📥 Commits

Reviewing files that changed from the base of the PR and between ef9f211 and a1c2ac7.

⛔ Files ignored due to path filters (1)

• go.sum is excluded by !**/*.sum

📒 Files selected for processing (21)

• .github/workflows/ci.yml
• .github/workflows/release.yml
• README.md
• go.mod
• main.go
• main_test.go
• manifest.json
• provider/audible_scrape.go
• provider/audimeta.go
• provider/audimeta_test.go
• provider/audiobookcovers.go
• provider/audiobookcovers_test.go
• provider/audioteka.go
• provider/audnexus.go
• provider/audnexus_test.go
• provider/bookbeat.go
• provider/itunes.go
• provider/itunes_test.go
• provider/provider.go
• provider/regional_scrape_parsing.go
• provider/storytel_scrape.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch cursor/rebrand-silo-to-prairie-b9a3

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