Add small-account allocation drift notes

[Pigbibi]

Summary

• add shared helpers to estimate projected small-account allocation drift after whole-share orders
• add formatter for localized drift notifications
• cover submitted-order, large-account skip, non-target symbol filtering, and i18n formatting cases

Tests

• PYTHONPATH=/home/ubuntu/Projects/QuantPlatformKit/src timeout 120 python -m unittest tests.test_small_account_compatibility

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Handle ExecutionReport submitted orders

When callers pass the ExecutionReport objects produced by this package's broker adapters (src/quant_platform_kit/common/models.py:70-79), they are not Mappings, so this guard drops every submitted order. In that case a submitted one-share buy is still projected as value 0 and the drift notification reports the wrong allocation; accept attribute-based reports here or normalize them before this check.

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