[codex] Provider vault secrets UX (#6381)

## Thinking Path

> - Paperclip orchestrates AI agents that need scoped, auditable access
to secrets
> - Hosted and external deployments need provider vault configuration
without exposing secret values in Paperclip metadata
> - AWS Secrets Manager vault setup previously required too much manual
operator knowledge
> - Provider vault discovery and removal belong together as an
independent secrets-management improvement
> - This pull request adds AWS provider vault discovery/prefill plus
vault removal flows
> - The benefit is a safer operator path for configuring external secret
storage before higher-level cloud workflows depend on it

## What Changed

- Added shared validators/types for AWS provider vault discovery
payloads and safe provider metadata.
- Implemented AWS provider vault discovery preview on the server.
- Added provider vault removal service/route behavior.
- Added Secrets page UI for discovery prefill, removal messaging, and
related rendering coverage.
- Added Storybook provider-vault fixtures and captured screenshots for
the new UX states.

## Verification

- `pnpm install --frozen-lockfile --ignore-scripts`
- `pnpm exec vitest run packages/shared/src/validators/secret.test.ts
server/src/__tests__/aws-secrets-manager-provider.test.ts
server/src/__tests__/secrets-routes.test.ts
server/src/__tests__/secrets-service.test.ts
ui/src/pages/Secrets.render.test.tsx`
- Result: 4 files passed, 1 embedded Postgres-backed file skipped on
this host because local Postgres init was unavailable.
- `pnpm --filter @paperclipai/ui exec vitest run
src/pages/Secrets.render.test.tsx`
- `pnpm --filter @paperclipai/ui typecheck`
- Storybook screenshot capture against `Product/Secrets` on
`http://127.0.0.1:60381/iframe.html?id=product-secrets--secrets-inventory&viewMode=story&globals=theme:dark`

## Screenshots

Provider vaults tab after this change:

![Provider vaults
tab](https://raw.githubusercontent.com/paperclipai/paperclip/pap-9861-provider-vault-secrets/doc/screenshots/pr-6381/provider-vaults-tab.png)

AWS discovery candidate flow:

![AWS discovery candidate
flow](https://raw.githubusercontent.com/paperclipai/paperclip/pap-9861-provider-vault-secrets/doc/screenshots/pr-6381/aws-discovery-candidates.png)

Provider vault removal confirmation:

![Provider vault removal
confirmation](https://raw.githubusercontent.com/paperclipai/paperclip/pap-9861-provider-vault-secrets/doc/screenshots/pr-6381/remove-provider-vault-confirmation.png)

## Risks

- Secret provider metadata handling must remain non-sensitive;
validators reject credential-bearing Vault URLs and sensitive AWS
discovery keys.
- AWS discovery depends on deployment credentials being configured
correctly outside Paperclip-managed company secrets.

> For core feature work, check [`ROADMAP.md`](ROADMAP.md) first and
discuss it in `#dev` before opening the PR. Feature PRs that overlap
with planned core work may need to be redirected — check the roadmap
first. See `CONTRIBUTING.md`.

## Model Used

- OpenAI Codex, GPT-5-based coding agent with local shell/git/tool use.
Exact hosted model ID and context-window size are not exposed by the
local Paperclip adapter runtime.

## Checklist

- [x] I have included a thinking path that traces from project context
to this change
- [x] I have specified the model used (with version and capability
details)
- [x] I have checked ROADMAP.md and confirmed this PR does not duplicate
planned core work
- [x] I have run tests locally and they pass
- [x] I have added or updated tests where applicable
- [x] If this change affects the UI, I have included before/after
screenshots
- [x] I have updated relevant documentation to reflect my changes
- [x] I have considered and documented any risks above
- [x] I will address all Greptile and reviewer comments before
requesting merge

---------

Co-authored-by: Paperclip <noreply@paperclip.ing>

ui/storybook/fixtures/paperclipData.ts

@@ -7,6 +7,7 @@ import type {
   Company,
   CompanySecret,
   CompanySecretBinding,
+  CompanySecretProviderConfig,
   DashboardSummary,
   ExecutionWorkspace,
   Goal,
@@ -15,6 +16,7 @@ import type {
   IssueLabel,
   Project,
   SecretAccessEvent,
+  SecretProviderConfigDiscoveryPreviewResult,
   SecretProviderDescriptor,
   SidebarBadges,
   WorkspaceRuntimeService,
@@ -1324,6 +1326,98 @@ export const storybookSecretProviders: SecretProviderDescriptor[] = [
   { id: "vault", label: "HashiCorp Vault", requiresExternalRef: false },
 ];
 
+export const storybookSecretProviderConfigs: CompanySecretProviderConfig[] = [
+  {
+    id: "provider-config-local",
+    companyId: "company-storybook",
+    provider: "local_encrypted",
+    displayName: "Local encrypted default",
+    status: "ready",
+    isDefault: true,
+    config: { backupReminderAcknowledged: true },
+    healthStatus: "ready",
+    healthCheckedAt: recent(45),
+    healthMessage: "Local encrypted provider is healthy.",
+    healthDetails: null,
+    disabledAt: null,
+    createdByAgentId: null,
+    createdByUserId: "user-board",
+    createdAt: recent(2_400),
+    updatedAt: recent(45),
+  },
+  {
+    id: "provider-config-aws-prod",
+    companyId: "company-storybook",
+    provider: "aws_secrets_manager",
+    displayName: "AWS production",
+    status: "warning",
+    isDefault: false,
+    config: {
+      region: "us-east-1",
+      namespace: "prod-use1",
+      secretNamePrefix: "paperclip",
+      kmsKeyId: "alias/paperclip-secrets",
+      ownerTag: "platform",
+      environmentTag: "production",
+    },
+    healthStatus: "warning",
+    healthCheckedAt: recent(18),
+    healthMessage: "Connected; KMS key rotation policy not yet enforced.",
+    healthDetails: {
+      code: "kms_rotation_policy",
+      message: "Connected; KMS key rotation policy not yet enforced.",
+      guidance: ["Enable automatic key rotation before using this vault for production agents."],
+    },
+    disabledAt: null,
+    createdByAgentId: null,
+    createdByUserId: "user-board",
+    createdAt: recent(1_800),
+    updatedAt: recent(18),
+  },
+];
+
+export const storybookSecretProviderDiscoveryPreview: SecretProviderConfigDiscoveryPreviewResult = {
+  provider: "aws_secrets_manager",
+  nextToken: null,
+  sampledSecretCount: 6,
+  skippedForeignPaperclipSampleCount: 1,
+  warnings: ["Skipped 1 Paperclip-managed AWS secret from a different deployment namespace."],
+  candidates: [
+    {
+      provider: "aws_secrets_manager",
+      displayName: "AWS production",
+      config: {
+        region: "us-east-1",
+        namespace: "prod-use1",
+        secretNamePrefix: "paperclip",
+        kmsKeyId: "alias/paperclip-secrets",
+        ownerTag: "platform",
+        environmentTag: "production",
+      },
+      sampleCount: 5,
+      samples: [
+        {
+          name: "paperclip/prod-use1/company-storybook/openai_api_key",
+          hasKmsKey: true,
+          tagKeys: ["paperclip:managed-by", "paperclip:environment", "paperclip:provider-owner"],
+        },
+      ],
+      signals: {
+        namespace: "prod-use1",
+        secretNamePrefix: "paperclip",
+        environmentTag: "production",
+        ownerTag: "platform",
+        kmsKeyId: "alias/paperclip-secrets",
+        hasKmsKey: true,
+        sampleCount: 5,
+        paperclipManagedSampleCount: 5,
+        skippedForeignPaperclipSampleCount: 1,
+      },
+      warnings: [],
+    },
+  ],
+};
+
 export const storybookSecrets: CompanySecret[] = [
   {
     id: "secret-openai",