erste Fassung von Client und Server rein

server/catalog/symbols.json

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+{
+  "symbols": [
+    {
+      "id": "weiche_links_r300",
+      "label": "Weiche links R300",
+      "type": "weiche",
+      "radius": 300,
+      "direction": "left",
+      "svg_path": "M 0,0 L 100,0 Q 150,0 200,50",
+      "snap_points": [[0,0], [100,0], [200,50]],
+      "ports": ["in", "out_gerade", "out_abzweig"]
+    },
+    {
+      "id": "kreisel_standard",
+      "label": "Kreisel",
+      "type": "kreisel",
+      "geometry": {
+        "circle_top_r": 40,
+        "circle_bottom_r": 40,
+        "straight_length": 80
+      },
+      "svg_path": "M -40,0 A 40,40 0 1,1 40,0 A 40,40 0 1,1 -40,0 M -40,160 A 40,40 0 1,1 40,160 A 40,40 0 1,1 -40,160 M -40,0 L -40,160 M 40,0 L 40,160",
+      "snap_points": [[0,0], [0,160]]
+    }
+  ]
+}

server/main.py

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+"""
+PlantPlan FastAPI Backend
+- Symbolbibliothek ausliefern
+- Koordinaten normalisieren
+- JSON/SVG Export
+"""
+
+import json
+from pathlib import Path
+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+from pydantic import BaseModel
+
+app = FastAPI(title="PlantPlan API")
+
+# CORS: Erlaubt Zugriff vom lokalen Frontend Dev-Server
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["http://localhost:5173"],
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+CATALOG_DIR = Path(__file__).parent / "catalog"
+
+
+# --- Models ---
+
+class SketchPayload(BaseModel):
+    shapes: list[dict]
+    grid_size: int = 10
+
+
+# --- Endpoints ---
+
+@app.get("/symbols")
+async def get_symbols():
+    """Symbolbibliothek als JSON ausliefern."""
+    catalog_file = CATALOG_DIR / "symbols.json"
+    with open(catalog_file, encoding="utf-8") as f:
+        return json.load(f)
+
+
+@app.post("/normalize")
+async def normalize(payload: SketchPayload):
+    """Koordinaten auf Grid snappen und SVG-Pfade normalisieren."""
+    cleaned = []
+    for shape in payload.shapes:
+        s = dict(shape)
+        if "x" in s:
+            s["x"] = round(s["x"] / payload.grid_size) * payload.grid_size
+        if "y" in s:
+            s["y"] = round(s["y"] / payload.grid_size) * payload.grid_size
+        cleaned.append(s)
+    return {"shapes": cleaned}
+
+
+@app.post("/export")
+async def export_sketch(payload: SketchPayload):
+    """Finales Projektfile als JSON exportieren."""
+    return {
+        "json": {
+            "version": "1.0",
+            "shapes": payload.shapes,
+        }
+    }

server/requirements.txt

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+fastapi>=0.115.0
+uvicorn[standard]>=0.34.0
+pydantic>=2.0.0