feat(matplotlib): implement histogram-basic (#486)

## Summary
Implements `histogram-basic` for **matplotlib** library.

**Parent Issue:** #206
**Sub-Issue:** #483
**Base Branch:** `plot/histogram-basic`
**Attempt:** 1/3

## Implementation
- `plots/matplotlib/hist/histogram-basic/default.py`

## Details
- Uses `ax.hist()` with 30 bins for distribution visualization
- Follows style guide: 4800 x 2700 px image size
- Uses Python Blue (#306998) as the primary color
- Includes proper axis labels, title, and subtle y-axis grid
- Data: 500 normally distributed values (mean=100, std=15)

Co-authored-by: claude[bot] <41898282+claude[bot]@users.noreply.github.com>
Co-authored-by: Markus Neusinger <2921697+MarkusNeusinger@users.noreply.github.com>

Author: 3 people

plots/matplotlib/hist/histogram-basic/default.py

@@ -24,4 +24,4 @@
 ax.grid(True, alpha=0.3, axis="y")
 
 plt.tight_layout()
-plt.savefig("plot.png", dpi=300, bbox_inches="tight")
+plt.savefig("plot.png", dpi=300)