refactor: move backend files into backend/ directory

- src/, api.py, main.py, requirements.txt, Dockerfile, .env.example, configs/ -> backend/
- Dockerfile COPY paths updated for repo-root build context (HF Spaces compatible)
- render.yaml dockerfilePath updated to ./backend/Dockerfile
- README.md dockerfile_path updated for HF Spaces
- config.py project_root supports EUMORA_ROOT env var override for local dev

README.md

@@ -1,3 +1,14 @@
+---
+title: EUMORA API
+emoji: 🎵
+colorFrom: purple
+colorTo: blue
+sdk: docker
+app_port: 8000
+dockerfile_path: backend/Dockerfile
+pinned: false
+---
+
 # EUMORA - Emotion-Aware Music Recommendation System
 
 **Advanced lyrical emotion analysis with custom-trained transformer models and real-time visualization.**

Dockerfile → backend/Dockerfile

@@ -11,16 +11,16 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
 # ---- deps ----
 FROM base AS deps
 
-COPY requirements.txt .
+COPY backend/requirements.txt .
 RUN pip install --no-cache-dir --upgrade pip \
     && pip install --no-cache-dir -r requirements.txt
 
 # ---- app ----
 FROM deps AS app
 
-# Copy source (model files are excluded via .dockerignore)
-COPY src/ ./src/
-COPY api.py .
+# Copy source — paths relative to repo root (HF Spaces build context)
+COPY backend/src/ ./src/
+COPY backend/api.py .
 
 # HuggingFace cache lives in a writable dir
 ENV HF_HOME=/app/.cache/huggingface

{src → backend/src}/config.py

@@ -1,5 +1,6 @@
 """Configuration settings for EUMORA lyrical analysis."""
 
+import os
 from dataclasses import dataclass, field
 from pathlib import Path
 from typing import Dict, List, Optional
@@ -10,7 +11,12 @@ class Config:
     """Training and model configuration."""
 
     # Paths
-    project_root: Path = field(default_factory=lambda: Path(__file__).parent.parent)
+    # EUMORA_ROOT can be set to the repo root when running from outside backend/
+    project_root: Path = field(
+        default_factory=lambda: Path(
+            os.environ.get("EUMORA_ROOT", str(Path(__file__).parent.parent))
+        )
+    )
 
     @property
     def data_dir(self) -> Path:

render.yaml

@@ -2,7 +2,7 @@ services:
   - type: web
     name: eumora-api
     runtime: docker
-    dockerfilePath: ./Dockerfile
+    dockerfilePath: ./backend/Dockerfile
     plan: standard          # 4 GB RAM — required for DeBERTa inference
     numInstances: 1
     healthCheckPath: /health