refactor(config): Update Emacs configuration across multiple modules

- Prefix gptel backend names with "gptel-" for consistency
- Add denote-org-backlinks-for-heading keybinding
- Refine recentf exclusions for org journal files
- Remove org-default-priority setting
- Add gptel and denote backlink buffer rules to ibuffer
- Enable markdown-ts-mode for Emacs 31+ with truncate lines
- Add electric-pair support for equals sign
- Update popper and window management regexes for new buffer names

lisp/init-gptel.el

@@ -28,7 +28,7 @@
                        :description "the name of the buffer whose contents are to be retrieved"))
    :category "emacs")                     ; An arbitrary label for grouping
 
-  (gptel-make-openai "Kimi-Code"
+  (gptel-make-openai "gptel-Kimi-Code"
     :host "api.kimi.com"
     :endpoint "/coding/v1/chat/completions"
     :protocol "https"
@@ -44,7 +44,7 @@
                   ("Authorization" . ,(concat "Bearer " key))))))
 
   (setq gptel-model 'kimi-for-coding
-        gptel-backend (gptel-get-backend "Kimi-Code"))
+        gptel-backend (gptel-get-backend "gptel-Kimi-Code"))
 
   (defun my-gptel--sanitize-filename (name)
     "Clean NAME into a safe kebab-case filename string."
@@ -124,7 +124,7 @@ from the last 1500 characters of the buffer."
   
   :init
   (with-eval-after-load 'gptel
-    (gptel-make-openai "Kimi-Code-magit"
+    (gptel-make-openai "gptel-Kimi-Code-magit"
       :host "api.kimi.com"
       :endpoint "/coding/v1/chat/completions"
       :protocol "https"
@@ -141,7 +141,7 @@ from the last 1500 characters of the buffer."
                     ("Authorization" . ,(concat "Bearer " key))))))
 
     (setq gptel-magit-model 'kimi-for-coding
-          gptel-magit-backend (gptel-get-backend "Kimi-Code-magit"))))
+          gptel-magit-backend (gptel-get-backend "gptel-Kimi-Code-magit"))))
 
 (provide 'init-gptel)