yoda: re-apply hard rename — libcosmic → libcosmic-yoda (0.1.0-yoda)

Reverts the soft-fork pivot (6736a596). Strategy chosen with user:
full cascade fork. Every consumer (leyoda/cosmic-files + each leyoda/app)
depends on libcosmic-yoda by explicit path, so there are no transitive
deps left asking for the upstream 'libcosmic' crate — no [patch]
unification issues, no two-version traps.

Changes:
- Cargo.toml: name = libcosmic-yoda, version = 0.1.0-yoda
- i18n/*/libcosmic.ftl -> libcosmic_yoda.ftl (71 locales)
- examples/*/Cargo.toml dep refs back to libcosmic-yoda
- compat stub features (winit=[], x11=[]) kept for upstream deps that
  might still request them during the migration window

cargo check --lib passes.

i18n/zh-Hans/libcosmic_yoda.ftl

@@ -0,0 +1,34 @@
+close = 关闭
+license = 许可证
+links = 链接
+developers = 开发者
+designers = 设计师
+translators = 译者
+january = { $year }年1月
+february = { $year }年2月
+march = { $year }年3月
+april = { $year }年4月
+may = { $year }年5月
+june = { $year }年6月
+july = { $year }年7月
+august = { $year }年8月
+september = { $year }年9月
+october = { $year }年10月
+november = { $year }年11月
+december = { $year }年12月
+monday = 星期一
+tuesday = 星期二
+wednesday = 星期三
+thursday = 星期四
+friday = 星期五
+saturday = 星期六
+sunday = 星期日
+artists = 艺术家
+documenters = 文档作者
+mon = 周一
+tue = 周二
+wed = 周三
+thu = 周四
+fri = 周五
+sat = 周六
+sun = 周日