Added complete NLT (New Living Translation) support and NKJV fixes

**NLT Integration:**
- Added NLT directory structure matching ESV/NKJV pattern
- Updated Dockerfile to COPY NLT /app/NLT
- Added NLT_DATA_DIR path and search engine initialization
- Updated getDataDir and /versions endpoints to support NLT
- Frontend will automatically include NLT in version dropdown

**NKJV Fixes:**
- Fixed thousands of NKJV chapter files (encoding, formatting issues)
- All NKJV content now serves correctly
- Preserves existing favorites and search functionality

**Complete 3-Version Bible Library:**
- ESV (English Standard Version) ✓
- NKJV (New King James Version) ✓
- NLT (New Living Translation) ✓

All versions now follow consistent directory structure and Docker integration!

NKJV/49_Ephesians/Chapter_01.md

@@ -1,3 +1,4 @@
+Greeting
 
 # Chapter 1
 1. Paul, an apostle of Jesus Christ by the will of God,

NKJV/49_Ephesians/Chapter_02.md

@@ -1,3 +1,4 @@
+By Grace Through Faith
 
 # Chapter 2
 1. And you He made alive, who were dead in trespasses and sins,

NKJV/49_Ephesians/Chapter_03.md

@@ -1,3 +1,4 @@
+The Mystery Revealed
 
 # Chapter 3
 1. For this reason I, Paul, the prisoner of Christ Jesus for you Gentiles--

NKJV/49_Ephesians/Chapter_04.md

@@ -1,3 +1,4 @@
+Walk in Unity
 
 # Chapter 4
 1. I, therefore, the prisoner of the Lord, beseech you to walk worthy of the calling with which you were called,

NKJV/49_Ephesians/Chapter_05.md

@@ -1,3 +1,4 @@
+Walk in Love
 
 # Chapter 5
 1. Therefore be imitators of God as dear children.

NKJV/49_Ephesians/Chapter_06.md

@@ -1,3 +1,4 @@
+Children and Parents
 
 # Chapter 6
 1. Children, obey your parents in the Lord, for this is right.