use sqlite to save index, major thread pool refactor

src/ctx.c

@@ -3,9 +3,10 @@
 ScanCtx_t ScanCtx = {
         .stat_index_size = 0,
         .stat_tn_size = 0,
-        .dbg_current_files = NULL,
-        .pool = NULL
+        .pool = NULL,
+        .index.path = {0,},
 };
 WebCtx_t WebCtx;
 IndexCtx_t IndexCtx;
 LogCtx_t LogCtx;
+__thread ProcData_t ProcData;