feat(beads-server): deploy BeadBoard task visualization dashboard

Add BeadBoard (zenchantlive/beadboard) alongside Dolt server and Workbench
for task dependency graph, kanban, and agent coordination views.

- Built custom Docker image (registry.viktorbarzin.me:5050/beadboard)
- ConfigMap provides .beads/metadata.json pointing to Dolt server
- Behind Authentik auth at beadboard.viktorbarzin.me
- Also fixed: GraphQL ingress now has Authentik middleware
- Also fixed: Workbench store.json type enum (mysql → Mysql)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

stacks/beads-server/tiers.tf

@@ -0,0 +1,10 @@
+# Generated by Terragrunt. Sig: nIlQXj57tbuaRZEa
+locals {
+  tiers = {
+    core    = "0-core"
+    cluster = "1-cluster"
+    gpu     = "2-gpu"
+    edge    = "3-edge"
+    aux     = "4-aux"
+  }
+}