Introduce a client for fetching subscription data from the claude.ai web
API, enabling rate-limit monitoring and overage tracking in the dashboard.
New package internal/claudeai:
- Client authenticates via session cookie (sk-ant-sid... prefix validated)
- FetchAll() retrieves orgs, usage windows, and overage in one call,
returning partial data when individual requests fail
- FetchOrganizations/FetchUsage/FetchOverageLimit for granular access
- Defensive utilization parsing handles polymorphic API responses: int
(75), float (0.75 or 75.0), and string ("75%" or "0.75"), normalizing
all to 0.0-1.0 range
- 10s request timeout, 1MB body limit, proper status code handling
(401/403 -> ErrUnauthorized, 429 -> ErrRateLimited)
Types (claudeai/types.go):
- Organization, UsageResponse, UsageWindow (raw), OverageLimit
- SubscriptionData (TUI-ready aggregate), ParsedUsage, ParsedWindow
Config changes (config/config.go):
- Add ClaudeAIConfig struct with session_key and org_id fields
- Add GetSessionKey() with CLAUDE_SESSION_KEY env var fallback
- Fix directory permissions 0o755 -> 0o750 (gosec G301)
- Fix Save() to propagate encoder errors before closing file
547d402578