Analytics: Per-key and per-project metrics UI

[cuevaio]

Description

Build analytics dashboards for API keys and projects.

API Key Analytics

• Simple usage chart (requests over time)
• Cost over time chart
• Recent logs list (status, duration, cost)

Project Analytics

• Aggregated usage across all keys
• Aggregated cost across all keys
• Per-key breakdown

Tasks

• Design and implement back-end endpoints for fetching aggregates
• Create API key analytics view
• Create project analytics view
• Implement usage chart component
• Implement cost chart component
• Implement recent logs table
• Add date range filtering

Acceptance Criteria

• Users can view usage and cost metrics per API key
• Users can view aggregated metrics per project
• Charts are readable and performant
• Recent logs show relevant execution details