Task: Rotation macro data endpoint

Goal

Add the macro data endpoint that provides the full sector rotation overview with all required fields for the frontend.

Requirements

Endpoint: `GET /api/v1/rotation/macro-full`

Returns complete sector rotation data:

All sectors with their current ranking
Momentum scores (20d, 50d)
Relative strength vs benchmark
Rotation signals (bullish/bearish/neutral)
Rank changes from previous period

Response model `FullRotationResponse` in `schemas/rotation.py`

class FullRotationResponse(BaseModel):
    sectors: list[SectorRotationDetail]
    benchmark: str
    as_of: str  # ISO timestamp
    period: str  # e.g., "20d"

Service method

Add get_full_rotation(period="20d") to rotation_service.py:

Queries all sector data
Joins with benchmark data
Returns formatted response

Acceptance Criteria

/api/v1/rotation/macro-full returns complete rotation data
All fields properly typed and validated
Tests pass for new endpoint
File stays under 200 lines

Files to Modify

src/backend/services/rotation_service.py
src/backend/routers/rotation.py
src/backend/schemas/rotation.py

Files to Read First

src/backend/services/rotation_service.py — current state
src/backend/routers/rotation.py — existing endpoints
src/backend/schemas/rotation.py — existing schemas

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