Pass provider settings to model discovery

[intel352]

Summary

• carry provider-specific settings through AddProviderReq and daemon storage
• prompt Bedrock users for AWS access key ID, hidden secret access key, region, and optional session token
• pass settings into dynamic model enumeration so Bedrock can list real Anthropic models via workflow-plugin-agent v0.12.5
• keep custom model entry as the fallback when dynamic enumeration fails

Provider behavior

• OpenAI API, Anthropic, Gemini, GitHub Copilot, ChatGPT account auth, and local providers continue using provider-owned dynamic model discovery
• Bedrock now supplies the extra AWS settings needed by the provider-owned dynamic discovery path

Tests

• go test ./cmd/ratchet ./internal/daemon ./internal/provider -count=1
• go test ./internal/tui -run TestTUIBinarySmoke -count=1
• go test ./... (provider-related packages passed; one full-suite run hit a timing-sensitive TestTUIBinarySmoke timeout, then the isolated smoke test passed)

Upstream

• Depends on workflow-plugin-agent v0.12.5
• Provider PR: List Bedrock models dynamically workflow-plugin-agent#38

[Copilot]

Pull request overview

This PR threads provider-specific “settings” through the provider add flow (CLI → proto → daemon DB) and into dynamic model discovery, with a focus on enabling AWS Bedrock-backed Anthropic model enumeration via workflow-plugin-agent v0.12.5.

Changes:

• Add a settings field to AddProviderReq and persist normalized settings in the daemon DB.
• Add Bedrock-specific credential prompting in the CLI and pass settings into dynamic model listing.
• Bump workflow-plugin-agent (and related AWS SDK deps) to support settings-aware model discovery.

Reviewed changes

Copilot reviewed 8 out of 10 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
internal/provider/models.go	Adds a settings-aware wrapper for model listing.
internal/provider/auth.go	Generalizes hidden secret prompting via PromptSecret.
internal/proto/ratchet.proto	Extends AddProviderReq with a settings field.
internal/proto/ratchet.pb.go	Regenerates protobuf output to include settings.
internal/daemon/service.go	Normalizes/validates settings and persists them on upsert.
internal/daemon/e2e_provider_test.go	Adds E2E coverage for settings persistence/validation.
cmd/ratchet/cmd_provider.go	Prompts Bedrock credentials/settings; passes settings into model discovery and AddProvider.
cmd/ratchet/cmd_provider_test.go	Adds unit tests for settings JSON and Bedrock prompt helpers; updates model selection tests for settings passing.
go.mod	Bumps workflow-plugin-agent and updates indirect AWS deps.
go.sum	Updates sums for bumped/new dependencies.

Files not reviewed (1)

• internal/proto/ratchet.pb.go: Generated file

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