[ci skip] Flatten module wrappers into stack roots

Remove the module "xxx" { source = "./module" } indirection layer
from all 66 service stacks. Resources are now defined directly in
each stack's main.tf instead of through a wrapper module.

- Merge module/main.tf contents into stack main.tf
- Apply variable replacements (var.tier -> local.tiers.X, renamed vars)
- Fix shared module paths (one fewer ../ at each level)
- Move extra files/dirs (factory/, chart_values, subdirs) to stack root
- Update state files to strip module.<name>. prefix
- Update CLAUDE.md to reflect flat structure

Verified: terragrunt plan shows 0 add, 0 destroy across all stacks.

stacks/f1-stream/module/files/internal/store/health.go

@@ -1,37 +0,0 @@
-package store
-
-import (
-	"f1-stream/internal/models"
-)
-
-func (s *Store) LoadHealthStates() ([]models.HealthState, error) {
-	s.healthMu.RLock()
-	defer s.healthMu.RUnlock()
-	var states []models.HealthState
-	if err := readJSON(s.filePath("health_state.json"), &states); err != nil {
-		return nil, err
-	}
-	return states, nil
-}
-
-func (s *Store) SaveHealthStates(states []models.HealthState) error {
-	s.healthMu.Lock()
-	defer s.healthMu.Unlock()
-	return writeJSON(s.filePath("health_state.json"), states)
-}
-
-// HealthMap returns a map of URL -> Healthy status. It reads the health state
-// file directly without acquiring healthMu to avoid deadlock when called from
-// methods that already hold other locks (e.g., PublicStreams, GetActiveScrapedLinks).
-// URLs not present in the map are implicitly healthy.
-func (s *Store) HealthMap() map[string]bool {
-	var states []models.HealthState
-	if err := readJSON(s.filePath("health_state.json"), &states); err != nil {
-		return make(map[string]bool)
-	}
-	m := make(map[string]bool, len(states))
-	for _, st := range states {
-		m[st.URL] = st.Healthy
-	}
-	return m
-}