feat: Add GatherManager + AutoDoors plugin config modules

- GatherManager: 2-tab editor (Resource Rates with 1x-10x presets,
  Advanced with Pickup/Quarry/Excavator/Survey modifiers), 9 resource
  types with slider+number inputs, CRUD + deploy + import via NATS
- AutoDoors: Global settings (delay sliders, 6 toggles), 7 door type
  toggles, permission group overrides table, CRUD + deploy + import
- DB: migrations 015 (gather_configs) + 018 (autodoors_configs)
- Backend: GatherModule + AutoDoorsModule registered in app.module.ts
- Frontend: Pinia stores, Vue views, router routes, sidebar nav items
- Icons: Pickaxe (gather), DoorOpen (autodoors)
- All type checks pass: tsc + vue-tsc zero errors

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/migrations/015_gather_configs.sql

@@ -0,0 +1,11 @@
+CREATE TABLE IF NOT EXISTS gather_configs (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    license_id UUID NOT NULL REFERENCES licenses(id) ON DELETE CASCADE,
+    config_name VARCHAR(100) NOT NULL,
+    description TEXT,
+    config_data JSONB NOT NULL DEFAULT '{}',
+    is_active BOOLEAN NOT NULL DEFAULT false,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+CREATE INDEX idx_gather_configs_license ON gather_configs(license_id);

backend/migrations/018_autodoors_configs.sql

@@ -0,0 +1,11 @@
+CREATE TABLE IF NOT EXISTS autodoors_configs (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    license_id UUID NOT NULL REFERENCES licenses(id) ON DELETE CASCADE,
+    config_name VARCHAR(100) NOT NULL,
+    description TEXT,
+    config_data JSONB NOT NULL DEFAULT '{}',
+    is_active BOOLEAN NOT NULL DEFAULT false,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+CREATE INDEX idx_autodoors_configs_license ON autodoors_configs(license_id);