docs(budcustomer): add Customer Dashboard portal guide

[jithinAB]

Motivation

• Provide a single, customer-facing reference for the Customer Dashboard experience covering discovery, observability, billing, API keys and project workflows.
• Capture UI patterns used in the app (sidebar, drawers, tabs, filters, copy/download actions) and mirror the style and structure used by existing docs such as docs/models/models.mdx.

Description

• Add a new documentation page at docs/customer-dashboard/customer-dashboard.mdx describing the portal, USPs, features, how-to guides and FAQ.
• The document explains key UI flows and components (Models catalog and drawer tabs, Playground iframe, Logs metrics/requests, Observability detail, Usage & Billing, API Keys, Projects, Audit) and details filters, search, buttons, tabs and drawer actions.
• This is a documentation-only change with no code, infra, or runtime modifications.

Testing

• No automated tests were executed because this is a documentation-only change and does not affect runtime code or services.
• Recommended pre-merge checks (not executed here): run pre-commit run --all-files, frontend checks npm run lint / npm run typecheck in affected frontends, and validate docs build if your CI includes a docs staging step (e.g., site build).

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Codex Task

[gemini-code-assist]

Summary of Changes

Hello @jithinAB, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances the customer-facing documentation by introducing a dedicated guide for the Bud Customer Dashboard. Its purpose is to provide a single, comprehensive reference point for users to understand and effectively utilize the portal's capabilities, ensuring a consistent and guided experience across all features.

Highlights

• Comprehensive Customer Dashboard Guide: Introduces a new documentation page for the Bud Customer Dashboard, detailing its features, unique selling propositions, and how-to guides for various functionalities like model discovery, observability, usage tracking, API key management, and project workflows.

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[gemini-code-assist]

Code Review

This pull request introduces a comprehensive and well-structured documentation page for the Customer Dashboard. The new guide is detailed, clearly written, and accurately reflects the features present in the application code, following the style of existing documentation. I have provided a few minor suggestions to enhance consistency in terminology throughout the document. Overall, this is an excellent and valuable addition.

[gemini-code-assist]

For consistency within this document, please use 'time range' (unhyphenated) instead of 'time-range'. This will align with other mentions like 'date range' on line 81.

- View-by segmentation (Model, Project) with time range selection.

[gemini-code-assist]

For consistency with other parts of the document, please use 'time range' instead of 'time-range'.

- Project and time range selectors (1d/7d/30d/90d).

[gemini-code-assist]

To maintain consistency with other descriptions in this document (e.g., 'Export (CSV) actions' on line 84), please consider rephrasing 'export-to-CSV action'.

- Clear filters control and Export (CSV) action.