feat(ai): implement intelligent auto-tagging system

- Added multi-provider AI infrastructure (OpenAI/Ollama)
- Implemented real-time tag suggestions with debounced analysis
- Created AI diagnostics and database maintenance tools in Settings
- Added automated garbage collection for orphan labels
- Refined UX with deterministic color hashing and interactive ghost tags

_bmad-output/implementation-artifacts/sprint-status.yaml

@@ -0,0 +1,56 @@
+# generated: 2026-01-08
+# project: Keep
+# project_key: keep
+# tracking_system: file-system
+# story_location: _bmad-output/implementation-artifacts
+
+# STATUS DEFINITIONS:
+# ==================
+# Epic Status:
+#   - backlog: Epic not yet started
+#   - in-progress: Epic actively being worked on
+#   - done: All stories in epic completed
+#
+# Story Status:
+#   - backlog: Story only exists in epic file
+#   - ready-for-dev: Story file created in stories folder
+#   - in-progress: Developer actively working on implementation
+#   - review: Ready for code review (via Dev's code-review workflow)
+#   - done: Story completed
+
+generated: 2026-01-08
+project: Keep
+project_key: keep
+tracking_system: file-system
+story_location: _bmad-output/implementation-artifacts
+
+development_status:
+  epic-1: done
+  1-1-mise-en-place-de-l-infrastructure-muuri: done
+  1-2-drag-and-drop-fluide-et-persistant: done
+  1-3-robustesse-du-layout-avec-resizeobserver: done
+  epic-1-retrospective: done
+
+  epic-2: in-progress
+  2-1-infrastructure-ia-abstraction-provider: done
+  2-2-analyse-et-suggestions-de-tags-en-temps-reel: done
+  2-3-validation-des-suggestions-par-l-utilisateur: backlog
+  epic-2-retrospective: optional
+
+  epic-3: backlog
+  3-1-indexation-vectorielle-automatique: backlog
+  3-2-recherche-semantique-par-intention: backlog
+  3-3-vue-de-recherche-hybride: backlog
+  epic-3-retrospective: optional
+
+  epic-4: backlog
+  4-1-installation-pwa-et-manifeste: backlog
+  4-2-stockage-local-et-mode-offline: backlog
+  4-3-synchronisation-de-fond-background-sync: backlog
+  epic-4-retrospective: optional
+
+  epic-5: in-progress
+  5-1-interface-de-configuration-des-modeles: done
+  5-2-gestion-avancee-epinglage-archivage: backlog
+  5-3-support-multimedia-et-images: backlog
+  epic-5-retrospective: optional