step 1: rename module chat-switchboard → switchboard-core

- go.mod module name
- All 714 import references across 289 Go files
- VERSION: 0.1.0
- CI DB names: switchboard_core_{ci,dev,test}
- Docker image: gobha/switchboard-core
- Test fixtures: JWT issuer, repo names
- .env.example, docker-compose container name
- Compiles clean (go build exit 0)

server/middleware/auth.go

@@ -11,9 +11,9 @@ import (
 	"github.com/gin-gonic/gin"
 	"github.com/golang-jwt/jwt/v5"
 
-	"chat-switchboard/config"
-	"chat-switchboard/database"
-	"chat-switchboard/store"
+	"switchboard-core/config"
+	"switchboard-core/database"
+	"switchboard-core/store"
 )
 
 // Claims represents the JWT payload. Must match handlers.Claims.