feat: add LanceDB vector store with upsert, delete, and search

sample-data/Default/Journal/2026/04/2026-04-07.md

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+#DayInShort: Half baked day!
+#physicalhealth: It is fine. I slept for an hour in the evening.
+#mentalhealth: Kind of ok.
+#work: I am getting a direction now, on where to focus. that is a good sign, I would say.
+#Food:
+	#Breakfast: nothing
+	#Lunch: rice
+	#Dinner: tea
+#Relations: [[Person/VJ]], [[Person/Inba]], [[Person/Swathi]], [[Person/Swathi's parents]]
+#finance: Bought a book stand
+#movie: nothing yet. but will continue [[MoviesShows/Midnight mass]].
+#selfimprovement: [[Org/Google]] [[Concept/AI]].