refactor(org-drill): hoist the commands out of :config and clear the byte-compile warnings

The `cj/drill-*` defuns and `cj/drill-map` lived inside the `use-package org-drill` `:config` block, so the byte-compiler never registered them — every cross-reference between them warned ("function `cj/drill-this-file' is not known", and so on). I moved all of that to module top level, where the compiler sees it. The ten `(setq org-drill-...)` lines became a `:custom` block (no more "assignment to free variable"). Added `(require 'user-constants)` and `(require 'keybindings)` for `drill-dir` and `cj/custom-keymap`, plus `declare-function` for `org-drill`, `org-drill-resume`, `org-capture`, and `org-refile`. The module byte-compiles clean now, and `C-; D` still mounts the drill submenu with the same leaf keys.

I also gave `tests/test-org-drill-first-function.el` a `cj/custom-keymap` stub: its "loads without error" test does a bare `load` of the module, which now runs the keymap mount at load time instead of deferring it inside `:config`.

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