feat(plotly): implement donut-labeled

plots/donut-labeled/implementations/plotly.py

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+"""
+donut-labeled: Donut Chart with Percentage Labels
+Library: plotly
+"""
+
+import plotly.graph_objects as go
+
+
+# Data - Budget allocation by department
+categories = ["Engineering", "Marketing", "Sales", "Operations", "R&D", "HR"]
+values = [35, 20, 18, 12, 10, 5]
+
+# Color palette from style guide
+colors = ["#306998", "#FFD43B", "#DC2626", "#059669", "#8B5CF6", "#F97316"]
+
+# Create donut chart
+fig = go.Figure(
+    data=[
+        go.Pie(
+            labels=categories,
+            values=values,
+            hole=0.55,
+            marker={"colors": colors, "line": {"color": "white", "width": 2}},
+            textinfo="percent",
+            textfont={"size": 20, "color": "white"},
+            textposition="inside",
+            hovertemplate="<b>%{label}</b><br>Value: %{value}<br>Percentage: %{percent}<extra></extra>",
+        )
+    ]
+)
+
+# Layout
+fig.update_layout(
+    title={"text": "Department Budget Allocation", "font": {"size": 28}, "x": 0.5, "xanchor": "center"},
+    legend={"orientation": "h", "yanchor": "bottom", "y": -0.15, "xanchor": "center", "x": 0.5, "font": {"size": 18}},
+    template="plotly_white",
+    margin={"t": 80, "b": 80, "l": 40, "r": 40},
+)
+
+# Save as PNG (4800 x 2700 px)
+fig.write_image("plot.png", width=1600, height=900, scale=3)
+
+# Save as HTML for interactivity
+fig.write_html("plot.html", include_plotlyjs="cdn")