feat(monitoring): generate daily tasks and optimize heartbeat writes

Adds a MonitoringDailyTaskWorker that materializes and dispatches
daily collect tasks from active subscription/desktop-client state,
with per-run atomic metrics and a Prometheus collector. Dashboard
and question-detail APIs now surface a platform_authorization_status
so the UI can distinguish no-desktop-client, no-authorized-platforms,
and authorized states; quota/access-state lookups resolve by request
workspace instead of tenant.

Hardens heartbeat: a desktop_client_primary_leases table gives
per-(tenant, workspace) sticky primary selection, read-mostly lease
resolution avoids a per-heartbeat transaction, and unchanged platform
access reports skip snapshot upserts outside a 10-minute refresh
window. Adds heartbeat primary/snapshot metrics exposed via
token-protected tenant-api /api/internal/metrics endpoints plus
Prometheus. Monitoring quota seed is removed from dev-seed since
daily plans now derive from desktop bindings, and the projection
uses the canonical six-platform catalog so platforms with zero
samples still render.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

server/internal/tenant/transport/router.go

@@ -8,6 +8,8 @@ import (
 )
 
 func RegisterRoutes(app *bootstrap.App) {
+	registerInternalMetricsRoutes(app)
+
 	authAPI := app.Engine.Group("/api/auth")
 	authHandler := NewAuthHandler(app)
 	authAPI.POST("/login", authHandler.Login)
@@ -21,6 +23,7 @@ func RegisterRoutes(app *bootstrap.App) {
 	protected := app.Engine.Group("/api")
 	protected.Use(auth.Middleware(app.JWT, app.Sessions))
 	protected.Use(middleware.TenantScope())
+	protected.Use(middleware.WorkspaceScope(app.DB))
 
 	protected.GET("/auth/me", authHandler.Me)
 	protected.POST("/auth/logout", authHandler.Logout)