fix: formatting and error message capitalization

- Run go fmt on modules/api/types.go to fix struct alignment
- Use lowercase error messages to match codebase conventions

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

modules/api/types.go

@@ -7,20 +7,20 @@ import "time"
 
 // ActionRun represents a workflow run
 type ActionRun struct {
-	ID           int64      `json:"id"`
-	Title        string     `json:"display_title"`
-	Path         string     `json:"path"`
-	Status       string     `json:"status"`
-	Conclusion   string     `json:"conclusion"`
-	Event        string     `json:"event"`
-	HeadBranch   string     `json:"head_branch"`
-	HeadSHA      string     `json:"head_sha"`
-	RunNumber    int64      `json:"run_number"`
-	RunAttempt   int64      `json:"run_attempt"`
-	HTMLURL      string     `json:"html_url"`
-	URL          string     `json:"url"`
-	StartedAt    *time.Time `json:"started_at"`
-	CompletedAt  *time.Time `json:"completed_at"`
+	ID          int64      `json:"id"`
+	Title       string     `json:"display_title"`
+	Path        string     `json:"path"`
+	Status      string     `json:"status"`
+	Conclusion  string     `json:"conclusion"`
+	Event       string     `json:"event"`
+	HeadBranch  string     `json:"head_branch"`
+	HeadSHA     string     `json:"head_sha"`
+	RunNumber   int64      `json:"run_number"`
+	RunAttempt  int64      `json:"run_attempt"`
+	HTMLURL     string     `json:"html_url"`
+	URL         string     `json:"url"`
+	StartedAt   *time.Time `json:"started_at"`
+	CompletedAt *time.Time `json:"completed_at"`
 }
 
 // ActionRunList is a list of workflow runs