fix: normalize paths starting with './' and fix OS-dependency issue

- Use forward slash for splitting after toPosix() conversion
- Remove leading './' from paths like './src' to normalize them to 'src'
- Update test expectations to match correct behavior

Author: daniel-lxs

src/services/code-index/vector-store/__tests__/qdrant-client.spec.ts

@@ -1679,14 +1679,10 @@ describe("QdrantVectorStore", () => {
 						must: [
 							{
 								key: "pathSegments.0",
-								match: { value: "." },
-							},
-							{
-								key: "pathSegments.1",
 								match: { value: "src" },
 							},
 						],
-					}, // Should still create filter for actual relative paths
+					}, // Should normalize "./src" to "src"
 					score_threshold: DEFAULT_SEARCH_MIN_SCORE,
 					limit: DEFAULT_MAX_SEARCH_RESULTS,
 					params: {

src/services/code-index/vector-store/qdrant-client.ts

@@ -381,7 +381,11 @@ export class QdrantVectorStore implements IVectorStore {
 					// Don't create a filter - search entire workspace
 					filter = undefined
 				} else {
-					const segments = normalizedPrefix.split("/").filter(Boolean)
+					// Remove leading "./" from paths like "./src" to normalize them
+					const cleanedPrefix = normalizedPrefix.startsWith("./")
+						? normalizedPrefix.slice(2)
+						: normalizedPrefix
+					const segments = cleanedPrefix.split("/").filter(Boolean)
 					if (segments.length > 0) {
 						filter = {
 							must: segments.map((segment, index) => ({