fix: remove duplicate /s suffix from throughput display

Fixed throughput display showing nonsensical "21,970.0125/s/s" by removing
redundant "/s" suffix from progress bar templates.

Root cause: indicatif's {per_sec} placeholder already formats the value
with "/s" suffix, so adding another "/s" in the template creates double
units like "items/s/s".

Fixed 3 progress bar templates:
1. Line 2665: create_simple_progress_bar() - removed "/s" after {per_sec}
2. Line 2686: create_enhanced_progress_bar() - removed "/s" after {per_sec}
3. Line 2712: create_batch_progress_bar() - removed "/s" after {per_sec}

Before: "21,970.0125/s/s"
After:  "21,970.01/s"

This provides correct throughput display during indexing phases.

Author: jruokola

crates/codegraph-mcp/src/indexer.rs

@@ -2662,7 +2662,7 @@ impl ProjectIndexer {
         pb.set_style(
             ProgressStyle::default_bar()
                 .template(
-                    "{spinner:.green} [{elapsed_precise}] [{bar:40.cyan/blue}] {pos}/{len} ({percent}%) {msg} | {per_sec}/s | ETA: {eta}",
+                    "{spinner:.green} [{elapsed_precise}] [{bar:40.cyan/blue}] {pos}/{len} ({percent}%) {msg} | {per_sec} | ETA: {eta}",
                 )
                 .unwrap()
                 .progress_chars("█▉▊▋▌▍▎▏ "), // Better visual progress
@@ -2683,7 +2683,7 @@ impl ProjectIndexer {
             ProgressStyle::default_bar()
                 .template(
                     "{spinner:.green} [{elapsed_precise}] [{bar:50.cyan/blue}] {pos}/{len}
-                {msg.bold} | Success Rate: {percent}% | Speed: {per_sec}/s | ETA: {eta}",
+                {msg.bold} | Success Rate: {percent}% | Speed: {per_sec} | ETA: {eta}",
                 )
                 .unwrap()
                 .progress_chars("█▉▊▋▌▍▎▏ "),
@@ -2709,7 +2709,7 @@ impl ProjectIndexer {
             ProgressStyle::default_bar()
                 .template(
                     "{spinner:.green} [{elapsed_precise}] [{bar:45.cyan/blue}] {pos}/{len} embeddings
-                💾 {msg} | {percent}% | {per_sec}/s | Memory: Optimized | ETA: {eta}",
+                💾 {msg} | {percent}% | {per_sec} | Memory: Optimized | ETA: {eta}",
                 )
                 .unwrap()
                 .progress_chars("█▉▊▋▌▍▎▏ "),