Add tests, server, resume training, and project cleanup

- Add 57 unit tests covering generators, models, and pipeline components
- Implement FastAPI HTTP service (server.py) with POST /solve and GET /health
- Add checkpoint resume (断点续训) to both CTC and regression training utils
- Fix device mismatch bug in CTC training (targets/input_lengths on GPU)
- Add pytest dev dependency to pyproject.toml
- Update .gitignore with data/solver/, data/real/, *.log
- Remove PyCharm template main.py
- Update training/__init__.py docs for solver training scripts

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tests/test_generators.py

@@ -0,0 +1,173 @@
+"""
+测试所有验证码生成器。
+
+每种生成器 generate() 1 张 → 验证返回类型、图片尺寸、标签格式。
+"""
+
+import re
+
+import pytest
+from PIL import Image
+
+from config import GENERATE_CONFIG, NORMAL_CHARS, MATH_CHARS, THREED_CHARS, SOLVER_CONFIG
+from generators import (
+    NormalCaptchaGenerator,
+    MathCaptchaGenerator,
+    ThreeDCaptchaGenerator,
+    ThreeDRotateGenerator,
+    ThreeDSliderGenerator,
+    SlideDataGenerator,
+    RotateSolverDataGenerator,
+)
+
+
+class TestNormalCaptchaGenerator:
+    def setup_method(self):
+        self.gen = NormalCaptchaGenerator(seed=0)
+        self.cfg = GENERATE_CONFIG["normal"]
+
+    def test_generate_returns_image_and_label(self):
+        img, label = self.gen.generate()
+        assert isinstance(img, Image.Image)
+        assert isinstance(label, str)
+
+    def test_image_size(self):
+        img, _ = self.gen.generate()
+        w, h = self.cfg["image_size"]
+        assert img.size == (w, h)
+
+    def test_label_chars_in_charset(self):
+        img, label = self.gen.generate()
+        assert len(label) >= 4
+        for ch in label:
+            assert ch in NORMAL_CHARS, f"char {ch!r} not in NORMAL_CHARS"
+
+    def test_generate_with_text(self):
+        img, label = self.gen.generate(text="AB12")
+        assert label == "AB12"
+
+
+class TestMathCaptchaGenerator:
+    def setup_method(self):
+        self.gen = MathCaptchaGenerator(seed=0)
+        self.cfg = GENERATE_CONFIG["math"]
+
+    def test_generate_returns_image_and_label(self):
+        img, label = self.gen.generate()
+        assert isinstance(img, Image.Image)
+        assert isinstance(label, str)
+
+    def test_image_size(self):
+        img, _ = self.gen.generate()
+        w, h = self.cfg["image_size"]
+        assert img.size == (w, h)
+
+    def test_label_is_expression(self):
+        """Label should be like '3+8' (expression without =? and without result)."""
+        img, label = self.gen.generate()
+        assert re.match(r"^\d+[+\-×÷]\d+$", label), f"unexpected label format: {label!r}"
+
+
+class TestThreeDCaptchaGenerator:
+    def setup_method(self):
+        self.gen = ThreeDCaptchaGenerator(seed=0)
+        self.cfg = GENERATE_CONFIG["3d_text"]
+
+    def test_generate_returns_image_and_label(self):
+        img, label = self.gen.generate()
+        assert isinstance(img, Image.Image)
+        assert isinstance(label, str)
+
+    def test_image_size(self):
+        img, _ = self.gen.generate()
+        w, h = self.cfg["image_size"]
+        assert img.size == (w, h)
+
+    def test_label_chars_in_charset(self):
+        img, label = self.gen.generate()
+        assert len(label) >= 4
+        for ch in label:
+            assert ch in THREED_CHARS, f"char {ch!r} not in THREED_CHARS"
+
+
+class TestThreeDRotateGenerator:
+    def setup_method(self):
+        self.gen = ThreeDRotateGenerator(seed=0)
+        self.cfg = GENERATE_CONFIG["3d_rotate"]
+
+    def test_generate_returns_image_and_label(self):
+        img, label = self.gen.generate()
+        assert isinstance(img, Image.Image)
+        assert isinstance(label, str)
+
+    def test_image_size(self):
+        img, _ = self.gen.generate()
+        w, h = self.cfg["image_size"]
+        assert img.size == (w, h)
+
+    def test_label_is_angle(self):
+        img, label = self.gen.generate()
+        angle = int(label)
+        assert 0 <= angle <= 359
+
+
+class TestThreeDSliderGenerator:
+    def setup_method(self):
+        self.gen = ThreeDSliderGenerator(seed=0)
+        self.cfg = GENERATE_CONFIG["3d_slider"]
+
+    def test_generate_returns_image_and_label(self):
+        img, label = self.gen.generate()
+        assert isinstance(img, Image.Image)
+        assert isinstance(label, str)
+
+    def test_image_size(self):
+        img, _ = self.gen.generate()
+        w, h = self.cfg["image_size"]
+        assert img.size == (w, h)
+
+    def test_label_is_offset(self):
+        img, label = self.gen.generate()
+        offset = int(label)
+        lo, hi = self.cfg["gap_x_range"]
+        assert lo <= offset <= hi
+
+
+class TestSlideDataGenerator:
+    def setup_method(self):
+        self.gen = SlideDataGenerator(seed=0)
+
+    def test_generate_returns_image_and_label(self):
+        img, label = self.gen.generate()
+        assert isinstance(img, Image.Image)
+        assert isinstance(label, str)
+
+    def test_image_size(self):
+        img, _ = self.gen.generate()
+        h, w = SOLVER_CONFIG["slide"]["cnn_input_size"]
+        assert img.size == (w, h)
+
+    def test_label_is_numeric(self):
+        img, label = self.gen.generate()
+        val = int(label)
+        assert val >= 0
+
+
+class TestRotateSolverDataGenerator:
+    def setup_method(self):
+        self.gen = RotateSolverDataGenerator(seed=0)
+
+    def test_generate_returns_image_and_label(self):
+        img, label = self.gen.generate()
+        assert isinstance(img, Image.Image)
+        assert isinstance(label, str)
+
+    def test_image_size(self):
+        img, _ = self.gen.generate()
+        h, w = SOLVER_CONFIG["rotate"]["input_size"]
+        assert img.size == (w, h)
+
+    def test_label_is_angle(self):
+        img, label = self.gen.generate()
+        angle = int(label)
+        assert 0 <= angle <= 359