Bump version to 1.1.6; fix storage bugs, tests, CI pipeline and Docker config

Storage fixes:
- Fix bloom filter hash2 OverflowDefect (uint64 instead of int Hash)
- Fix MemTable.put size calculation on overwrite (was leaking size)
- Fix fuzz_test duplicate-key issues in LSM delete and SSTable tests

Test fixes:
- Fix stress_test.nim: replace deprecated threadpool with std/threads
- Fix fuzz_test.nim: add missing imports (tables, algorithm, sets)
- Fix fuzz_test.nim: var sst for close() compatibility
- Remove unused imports from test_all.nim and bench_all.nim

Docker / CI fixes:
- Fix Dockerfile.source: invalid nimlang/nim:2.2.10-alpine tag → 2.2.10 + ubuntu:24.04 runtime
- Fix Dockerfile.source healthcheck (--spider → -qO- for 200 OK)
- Fix Dockerfile run comment ports (9470/9471 → 9912/9913)
- Fix scripts/docker-run.sh healthcheck port (9470 → 9912)
- Add ARG BUILD_DATE/VCS_REF to Dockerfile for docker-build.sh
- Update all version strings 1.1.4 → 1.1.6 across nimble/docker/source/docs

formal-verification/README.md

@@ -21,7 +21,7 @@ This directory contains TLA+ specifications for core BaraDB distributed-systems
 - Java Runtime Environment (JRE) 8+ — the bundled `tla2tools.jar` contains TLC and SANY.
 - Or [TLA+ Toolbox](https://lamport.azurewebsites.net/tla/toolbox.html) (GUI + TLC model checker).
 
-## Verified State Space (v1.1.4)
+## Verified State Space (v1.1.6)
 
 | Spec | States Generated | Distinct States | Depth |
 |------|-----------------|-----------------|-------|

formal-verification/run_all.sh

@@ -22,7 +22,7 @@ run_tlc() {
 }
 
 echo "=============================================="
-echo " BaraDB Formal Verification Suite v1.1.4"
+echo " BaraDB Formal Verification Suite v1.1.6"
 echo " Running TLC model checker on all specs"
 echo "=============================================="
 echo ""