Overhaul: real metrics, Git integration UI, open-source hygiene, root cleanup

Backend:
- GET /services/:id/metrics with real Docker container stats
- DELETE /git/providers/:id and GET repo branches endpoint

Frontend:
- Service detail shows real telemetry or honest empty states
- Live status distinguishes idle/polling/reconnecting
- Git providers section in Settings; repo+branch pickers in Add Service
- Real logo, compact Projects header, canvas fitView fix
- index.css deduplicated (1725 -> 1384 lines)
- Fixed smoke tests, lint errors, ToastProvider/context unification

Repo hygiene:
- Added LICENSE (MIT), CONTRIBUTING.md, SECURITY.md; rewrote README
- Untracked .env.prod and data/letsencrypt secrets; fixed .gitignore
- Removed legacy root src/internal/cmd and stale configs/docs/artifacts
- Moved guides and design references under docs/

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

app/backend/internal/api/logs.go

@@ -64,11 +64,15 @@ func handleGetLogs(c *gin.Context) {
 
 	dockerClient, exists := c.Get("docker_client")
 	if !exists || dockerClient == nil {
-		respondDependencyUnavailable(c, "docker", "Container log streaming is unavailable because Docker is not configured.")
+		respondEmptyServiceLogs(c, "Container log streaming is unavailable because Docker is not configured.")
 		return
 	}
 
-	client := dockerClient.(*docker.Client)
+	client, ok := dockerClient.(*docker.Client)
+	if !ok || client == nil {
+		respondEmptyServiceLogs(c, "Container log streaming is unavailable because Docker is not configured.")
+		return
+	}
 	containerName := fmt.Sprintf("containr-%s", serviceID)
 
 	logOpts := docker.LogOptions{
@@ -82,6 +86,10 @@ func handleGetLogs(c *gin.Context) {
 	ctx := context.Background()
 	logsReader, err := client.GetContainerLogs(ctx, containerName, logOpts)
 	if err != nil {
+		if isDockerNotFoundError(err) {
+			respondEmptyServiceLogs(c, "No container logs are available for this service yet.")
+			return
+		}
 		respondDependencyUnavailable(c, "docker", "Failed to fetch container logs. The container may be unavailable.")
 		return
 	}
@@ -156,6 +164,13 @@ func handleGetLogs(c *gin.Context) {
 	c.JSON(http.StatusOK, gin.H{"logs": logEntries})
 }
 
+func respondEmptyServiceLogs(c *gin.Context, message string) {
+	c.JSON(http.StatusOK, gin.H{
+		"logs":    []LogEntry{},
+		"message": message,
+	})
+}
+
 func handleGetDeploymentLogs(c *gin.Context) {
 	db, exists := c.Get("db")
 	if !exists {