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/50_Philippians/Chapter_01.md

@@ -1,3 +1,4 @@
+Greeting
 
 # Chapter 1
 1. Paul and Timothy, bondservants of Jesus Christ,

NKJV/50_Philippians/Chapter_02.md

@@ -1,3 +1,4 @@
+Unity Through Humility
 
 # Chapter 2
 1. Therefore if there is any consolation in Christ, if any comfort of love, if any fellowship of the Spirit, if any affection and mercy,

NKJV/50_Philippians/Chapter_03.md

@@ -1,3 +1,4 @@
+All for Christ
 
 # Chapter 3
 1. Finally, my brethren, rejoice in the Lord. For me to write the same things to you is not tedious, but for you it is safe.

NKJV/50_Philippians/Chapter_04.md

@@ -1,3 +1,4 @@
+Be Anxious for Nothing; Think These Thoughts
 
 # Chapter 4
 1. Therefore, my beloved and longed-for brethren, my joy and crown, so stand fast in the Lord, beloved.Be United, Joyful, and in Prayer