qtbase: enable Qt6Sql (bundled sqlite); plasma-framework: declare plasma-tier deps

plasma-framework (task #13, the Plasma grind) needs KF6Svg + PlasmaActivities +
Wayland; declare kf6-ksvg, kf6-plasma-activities, plasma-wayland-protocols,
qtwayland, kf6-kdbusaddons. kf6-plasma-activities' QML imports in turn require
Qt6Sql (activities database), which qtbase built with FEATURE_sql=OFF. Enable
FEATURE_sql + FEATURE_sqlite (bundled, FEATURE_system_sqlite=OFF) in the TARGET
qtbase config — Sql is broadly needed across the KDE desktop, not just activities.
This retriggers the qtbase->Qt->KDE relink cascade.

local/recipes/kde/plasma-framework/recipe.toml

@@ -23,6 +23,11 @@ dependencies = [
     "kf6-kconfig",
     "kf6-kconfigwidgets",
     "kf6-kpackage",
+    "kf6-ksvg",
+    "kf6-plasma-activities",
+    "plasma-wayland-protocols",
+    "qtwayland",
+    "kf6-kdbusaddons",
     "kf6-kservice",
     "kf6-kdeclarative",
     "kf6-kio",

local/recipes/qt/qtbase/recipe.toml

@@ -687,7 +687,9 @@ cmake "${COOKBOOK_SOURCE}" \
     -DFEATURE_vulkan=OFF \
      -DFEATURE_process=ON \
      -DFEATURE_testlib=OFF \
-    -DFEATURE_sql=OFF \
+    -DFEATURE_sql=ON \
+    -DFEATURE_sqlite=ON \
+    -DFEATURE_system_sqlite=OFF \
     -DFEATURE_printsupport=ON \
     -DFEATURE_system_zlib=ON \
     -DFEATURE_system_pcre2=OFF \