feat(phase1): implement OpenCV image processing pipeline

- Create ImageProcessor service with EXIF orientation detection
- Implement smart cropping via OpenCV contour detection (10% padding)
- Add text orientation detection using Hough line transform
- Resize and compress images to 1200px with 85% JPEG quality
- Generate 200px square thumbnails with center crop
- Fallback to Pillow if OpenCV fails
- Comprehensive test suite: 28 tests all passing
- File size validation (reject >10MB)
- Graceful error handling for corrupted/invalid images
- Update requirements.txt with opencv-python, piexif, python-magic

venv/lib/python3.12/site-packages/cv2/gapi/ie/__init__.pyi

@@ -0,0 +1,51 @@
+__all__: list[str] = []
+
+import cv2.typing
+import typing as _typing
+
+
+from cv2.gapi.ie import detail as detail
+
+
+# Enumerations
+TraitAs_TENSOR: int
+TRAIT_AS_TENSOR: int
+TraitAs_IMAGE: int
+TRAIT_AS_IMAGE: int
+TraitAs = int
+"""One of [TraitAs_TENSOR, TRAIT_AS_TENSOR, TraitAs_IMAGE, TRAIT_AS_IMAGE]"""
+
+Sync: int
+SYNC: int
+Async: int
+ASYNC: int
+InferMode = int
+"""One of [Sync, SYNC, Async, ASYNC]"""
+
+
+
+# Classes
+class PyParams:
+    # Functions
+    @_typing.overload
+    def __init__(self) -> None: ...
+    @_typing.overload
+    def __init__(self, tag: str, model: str, weights: str, device: str) -> None: ...
+    @_typing.overload
+    def __init__(self, tag: str, model: str, device: str) -> None: ...
+
+    def constInput(self, layer_name: str, data: cv2.typing.MatLike, hint: TraitAs = ...) -> PyParams: ...
+
+    def cfgNumRequests(self, nireq: int) -> PyParams: ...
+
+    def cfgBatchSize(self, size: int) -> PyParams: ...
+
+
+
+# Functions
+@_typing.overload
+def params(tag: str, model: str, weights: str, device: str) -> PyParams: ...
+@_typing.overload
+def params(tag: str, model: str, device: str) -> PyParams: ...
+
+

venv/lib/python3.12/site-packages/cv2/gapi/ie/detail/__init__.pyi

@@ -0,0 +1,12 @@
+__all__: list[str] = []
+
+ParamDesc_Kind_Load: int
+PARAM_DESC_KIND_LOAD: int
+ParamDesc_Kind_Import: int
+PARAM_DESC_KIND_IMPORT: int
+ParamDesc_Kind = int
+"""One of [ParamDesc_Kind_Load, PARAM_DESC_KIND_LOAD, ParamDesc_Kind_Import, PARAM_DESC_KIND_IMPORT]"""
+
+
+# Classes
+