Issue 26: Vendor Management Dashboard (Streamlit)

[laraibg786]

Goal

Create a web-based vendor management dashboard using Streamlit for vendors to manage licenses, view activation status, monitor heartbeats, and export audit trails.

Requirements

Functional

• Page 1 - Dashboard: Active licenses count, devices in grace mode, revoked licenses count, recent audit events (last 10).
• Page 2 - Licenses: Table with license_key, customer, status, created_at, expiry_date; filters by status/customer/date; actions: Create, View Detail, Revoke.
• Page 3 - Sessions: Active devices table with device_fingerprint_hash, status (ACTIVE/GRACE), last_heartbeat, grace_remaining; auto-refresh every 30s.
• Page 4 - Audit Log: Event table with filters and CSV export.
• Page 5 - Settings: Grace period, max offline hours, heartbeat interval, API key regeneration.
• JWT authentication via Streamlit session state.

Technical

• Framework: Streamlit 1.28+.
• Auth: JWT stored in session state; verify vendor_id claim.
• Database: Connect to PostgreSQL (read-only for dashboard views).
• CSV Export: RFC 4180 escaping, timestamp in filename.

Acceptance Criteria

• Vendor can log in and see their license dashboard.
• Vendor can create, view, and revoke licenses from the UI.
• Sessions page auto-refreshes every 30 seconds.
• Audit log CSV export downloads correctly.

Dependencies

• Blocked by: Issue 06: JWT Authentication #6, Issue 11: Create License Endpoint #11, Issue 12: List Licenses Endpoint #12, Issue 13: License Detail and Modify Endpoints #13, Issue 14: License Revoke Endpoint #14, Issue 15: Audit Event Service and CSV Export #15.
• Blocks: Issue 31: Dashboard Audit Log Views #31 (Audit Log Views).