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.cluster.yml

@@ -4,21 +4,21 @@ services:
   # -------------------------
   leader:
     build: .
-    container_name: upkeep-leader
+    container_name: uptop-leader
     ports:
       - "23234:23234" # SSH
       - "8080:8080"   # HTTP
     environment:
-      - UPKEEP_DB_TYPE=postgres
+      - UPTOP_DB_TYPE=postgres
       # Note: Port 5432 is correct here because we are talking INSIDE the network
-      - UPKEEP_DB_DSN=postgres://devuser:devpass@leader-db:5432/upkeep_dev?sslmode=disable
-      - UPKEEP_HTTP_PORT=8080
-      - UPKEEP_STATUS_ENABLED=true
-      - UPKEEP_STATUS_TITLE=Leader Node
+      - UPTOP_DB_DSN=postgres://devuser:devpass@leader-db:5432/uptop_dev?sslmode=disable
+      - UPTOP_HTTP_PORT=8080
+      - UPTOP_STATUS_ENABLED=true
+      - UPTOP_STATUS_TITLE=Leader Node
       
       # Cluster Config
-      - UPKEEP_CLUSTER_MODE=leader
-      - UPKEEP_CLUSTER_SECRET=mysecret
+      - UPTOP_CLUSTER_MODE=leader
+      - UPTOP_CLUSTER_SECRET=mysecret
     depends_on:
       - leader-db
     stdin_open: true
@@ -26,11 +26,11 @@ services:
 
   leader-db:
     image: postgres:15-alpine
-    container_name: upkeep-leader-db
+    container_name: uptop-leader-db
     environment:
       POSTGRES_USER: devuser
       POSTGRES_PASSWORD: devpass
-      POSTGRES_DB: upkeep_dev
+      POSTGRES_DB: uptop_dev
     volumes:
       - ./tmp/leader-data:/var/lib/postgresql/data
 
@@ -39,23 +39,23 @@ services:
   # -------------------------
   follower:
     build: .
-    container_name: upkeep-follower
+    container_name: uptop-follower
     ports:
       - "23233:23234" # SSH (Mapped to different host port)
       - "8081:8080"   # HTTP (Mapped to different host port)
     environment:
-      - UPKEEP_DB_TYPE=postgres
+      - UPTOP_DB_TYPE=postgres
       # Connects to its OWN database
-      - UPKEEP_DB_DSN=postgres://devuser:devpass@follower-db:5432/upkeep_dev?sslmode=disable
-      - UPKEEP_HTTP_PORT=8080
-      - UPKEEP_STATUS_ENABLED=true
-      - UPKEEP_STATUS_TITLE=Follower Node
+      - UPTOP_DB_DSN=postgres://devuser:devpass@follower-db:5432/uptop_dev?sslmode=disable
+      - UPTOP_HTTP_PORT=8080
+      - UPTOP_STATUS_ENABLED=true
+      - UPTOP_STATUS_TITLE=Follower Node
       
       # Cluster Config
-      - UPKEEP_CLUSTER_MODE=follower
-      - UPKEEP_CLUSTER_SECRET=mysecret
+      - UPTOP_CLUSTER_MODE=follower
+      - UPTOP_CLUSTER_SECRET=mysecret
       # IMPORTANT: Uses the Service Name "leader" to connect internally
-      - UPKEEP_PEER_URL=http://leader:8080
+      - UPTOP_PEER_URL=http://leader:8080
     depends_on:
       - follower-db
     stdin_open: true
@@ -63,10 +63,10 @@ services:
 
   follower-db:
     image: postgres:15-alpine
-    container_name: upkeep-follower-db
+    container_name: uptop-follower-db
     environment:
       POSTGRES_USER: devuser
       POSTGRES_PASSWORD: devpass
-      POSTGRES_DB: upkeep_dev
+      POSTGRES_DB: uptop_dev
     volumes:
       - ./tmp/follower-data:/var/lib/postgresql/data