refactor: Use cj/log-silently for debug messages

Converted debug/informational messages to use cj/log-silently instead of
message across multiple modules. These are automatic initialization or
background task messages that don't need minibuffer display but should
still be logged to *Messages* buffer.

Changes:
- org-agenda-config.el: Cache build/hit messages (4 messages)
- org-refile-config.el: Cache build/hit + mode switching (5 messages)
- org-export-config.el: reveal.js download message (1 message)
- auth-config.el: oauth2-auto cache fix message (1 message)
- quick-video-capture.el: initialization message (1 message)

All modules now require system-lib for cj/log-silently function.
Keeps UI clean while maintaining debuggability.

1 files changed, 2 insertions, 1 deletions

diff --git a/modules/auth-config.el b/modules/auth-config.el
index 52032c2a..83a7e2d0 100644
--- a/modules/auth-config.el
+++ b/modules/auth-config.el
@@ -23,6 +23,7 @@
 
 ;;; Code:
 
+(require 'system-lib)
 (eval-when-compile (require 'user-constants)) ;; defines authinfo-file location
 
 ;; -------------------------------- Auth Sources -------------------------------
@@ -95,7 +96,7 @@ This function re-implements the intended behavior with cache enabled."
 ;; Apply the fix via advice (survives package updates)
 (with-eval-after-load 'oauth2-auto
   (advice-add 'oauth2-auto--plstore-read :override #'cj/oauth2-auto--plstore-read-fixed)
-  (message "✓ oauth2-auto cache fix applied via advice"))
+  (cj/log-silently "✓ oauth2-auto cache fix applied via advice"))
 
 ;; ------------------------ Authentication Reset Utility -----------------------