feat: Add AI-driven auto-update & restructure into package

The monolithic check_updates.py has been split into the update_monitor/
package with separate modules for fetching, extraction, comparison,
classification, and notification. This makes the codebase easier to
navigate and test.

The flat services.yaml is replaced by per-service directories under
services/<name>/config.yaml, co-locating config with update scripts
and AI review examples.

When --auto-update is enabled, services with an auto-update.sh script
get their release notes classified by a local Ollama model (using
few-shot examples from review-examples/) to decide whether the update
can be applied automatically or needs manual admin intervention. Results
are reported in a single consolidated Matrix message.

Immich is the first service with auto-update configured, using 7
real release note examples to train the classifier.

services/immich/review-examples/auto-2.txt

@@ -0,0 +1,43 @@
+action: auto
+reason: Pure bug fix release. No new features, no breaking changes, no migrations required.
+---
+# v2.6.2
+
+This release addresses the following issues
+
+- Fixed a bug where the shared link would error out when public users upload to the shared link
+- Fixed a bug where the URL switching feature doesn't work with external URLs
+- Fixed a bug where the "add to album" selection box on the web doesn't include albums that are shared with the user
+- Fixed several issues regarding the search filter on the mobile app and the web
+
+
+<!-- Release notes generated using configuration in .github/release.yml at v2.6.2 -->
+
+## What's Changed
+### 🐛 Bug fixes
+* fix(mobile): simplified chinese not available by @YarosMallorca in https://github.com/immich-app/immich/pull/27066
+* fix(web): allow showing combobox items outside modals by @michelheusschen in https://github.com/immich-app/immich/pull/27075
+* fix(web): preserve album scroll when adding to other albums by @michelheusschen in https://github.com/immich-app/immich/pull/27078
+* fix(server): queue version check job when config changed by @uhthomas in https://github.com/immich-app/immich/pull/27094
+* fix: shared link add to album by @jrasm91 in https://github.com/immich-app/immich/pull/27063
+* fix: svelte reactivity issues by @danieldietzler in https://github.com/immich-app/immich/pull/27109
+* fix(mobile): cronet image cache clearing on android by @LeLunZ in https://github.com/immich-app/immich/pull/27054
+* fix(mobile): view similar photos from search by @YarosMallorca in https://github.com/immich-app/immich/pull/27149
+* fix(mobile): no results before applying filter by @YarosMallorca in https://github.com/immich-app/immich/pull/27155
+* fix(mobile): star rating always defaults to 0 by @YarosMallorca in https://github.com/immich-app/immich/pull/27157
+* fix: download original stale cache when edited by @danieldietzler in https://github.com/immich-app/immich/pull/27195
+* fix(web): restore duplicate viewer arrow key navigation by @michelheusschen in https://github.com/immich-app/immich/pull/27176
+* fix(web): update upload summary when removing items (#27035) by @Nicolas-micuda-becker in https://github.com/immich-app/immich/pull/27139
+* fix(mobile): option padding on search dropdowns by @YarosMallorca in https://github.com/immich-app/immich/pull/27154
+* fix(mobile): add keys to people list by @YarosMallorca in https://github.com/immich-app/immich/pull/27112
+* fix(mobile): add cookie for auxiliary url by @mertalev in https://github.com/immich-app/immich/pull/27209
+* fix: album picker show all albums by @danieldietzler in https://github.com/immich-app/immich/pull/27211
+* fix(server): album permissions for editors by @YarosMallorca in https://github.com/immich-app/immich/pull/27214
+* fix(mobile/web): album cover buttons consistency by @YarosMallorca in https://github.com/immich-app/immich/pull/27213
+### 📚 Documentation
+* fix(docs): clarify ML CPU architecture by @mmomjian in https://github.com/immich-app/immich/pull/27187
+
+## New Contributors
+* @Nicolas-micuda-becker made their first contribution in https://github.com/immich-app/immich/pull/27139
+
+**Full Changelog**: https://github.com/immich-app/immich/compare/v2.6.1...v2.6.2