chore: complete rename from go-upkeep to uptop

- Module path: gitea.lerkolabs.com/lerko/uptop
- Binary: cmd/uptop/
- All imports updated to full module path
- Env vars: UPKEEP_* → UPTOP_*
- Prometheus metrics: upkeep_* → uptop_*
- Default DB: uptop.db
- Docker image: lerko/uptop
- All docs, compose files, CI updated

Only remaining "go-upkeep" reference is the fork attribution in README.

docker-compose.dev.yml

@@ -4,19 +4,19 @@ services:
     build: 
       context: .
       dockerfile: Dockerfile
-    container_name: upkeep-dev
+    container_name: uptop-dev
     ports:
       - "23234:23234" # SSH Access
       - "8080:8080"   # HTTP (Push Monitors + Status Page)
     environment:
       # --- Database Configuration (Postgres) ---
-      - UPKEEP_DB_TYPE=postgres
-      - UPKEEP_DB_DSN=postgres://devuser:devpass@postgres:5432/upkeep_dev?sslmode=disable
+      - UPTOP_DB_TYPE=postgres
+      - UPTOP_DB_DSN=postgres://devuser:devpass@postgres:5432/uptop_dev?sslmode=disable
       
       # --- Web Server Configuration (Phase 4) ---
-      - UPKEEP_HTTP_PORT=8080
-      - UPKEEP_STATUS_ENABLED=true
-      - UPKEEP_STATUS_TITLE=Dev Infrastructure Status
+      - UPTOP_HTTP_PORT=8080
+      - UPTOP_STATUS_ENABLED=true
+      - UPTOP_STATUS_TITLE=Dev Infrastructure Status
     depends_on:
       - postgres
     stdin_open: true # Required for 'docker attach' (Local Admin Console)
@@ -25,11 +25,11 @@ services:
   # The Database
   postgres:
     image: postgres:15-alpine
-    container_name: upkeep-postgres
+    container_name: uptop-postgres
     environment:
       POSTGRES_USER: devuser
       POSTGRES_PASSWORD: devpass
-      POSTGRES_DB: upkeep_dev
+      POSTGRES_DB: uptop_dev
     ports:
       - "5432:5432" # Expose for external DB tools (DBeaver, etc.)
     volumes: