docs: audit all 157 tool pages against live schemas

Reconcile every tool page's parameters, defaults, and response shape against the tool's Zod settings schema and executionHint in code. Notable fixes: color-palette (add count + format params, hex output, median-cut algorithm), favicon (add 5 params, was documented as having none), qr-generate (add logoDataUri), convert (add ppm/eps/tga formats), video-loudnorm (-16 LUFS not -14), smart-crop (async 202 not sync 200), images-to-video (1080x1080 square), and several output-filename and behavior-note corrections.

Also normalize API endpoint paths to /api/v1/tools/<id> (no modality segment) and standardize curl examples on the Docker API port 1349. Verified with a clean docs build.

apps/docs/tools/video/video-loudnorm.md

@@ -8,7 +8,7 @@ Normalize video audio volume to the EBU R128 broadcast loudness standard.
 
 ## API Endpoint
 
-`POST /api/v1/tools/video/video-loudnorm`
+`POST /api/v1/tools/video-loudnorm`
 
 Accepts multipart form data with a video file. This tool has no configurable settings.
 
@@ -19,7 +19,7 @@ This tool has no parameters. It applies EBU R128 loudness normalization to the a
 ## Example Request
 
 ```bash
-curl -X POST http://localhost:1349/api/v1/tools/video/video-loudnorm \
+curl -X POST http://localhost:1349/api/v1/tools/video-loudnorm \
   -H "Authorization: Bearer si_your-api-key" \
   -F "file=@clip.mp4"
 ```
@@ -37,6 +37,6 @@ curl -X POST http://localhost:1349/api/v1/tools/video/video-loudnorm \
 
 ## Notes
 
-- Uses FFmpeg's two-pass `loudnorm` filter targeting -14 LUFS integrated loudness, the standard for streaming platforms.
+- Uses FFmpeg's `loudnorm` filter targeting -16 LUFS integrated loudness with -1.5 dBTP true peak and 11 LU loudness range (EBU R128 broadcast standard).
 - The source audio sample rate is preserved in the output.
 - If the video has no audio track, the request returns a 400 error.