Add optional SD-backed offline OUI labels

[p-keminer]

Summary

• add a compact SD-backed OUI lookup used while rendering AP and station details
• keep locally administered and unknown addresses explicit and keep WPS Brand separate
• include a reproducible database builder, documentation, and native tests without committing the generated database

Testing

• Focused ESP32-C5 tests verified database upload/download hash, known, unknown, and local AP labels, separate WPS Brand, unique station/clone labels, reboot persistence, and unchanged unrelated SD files.
• The standalone no-database checklist field remained unfilled, so that subcase is not claimed separately.

[codecov]

Codecov Report

❌ Patch coverage is 62.85141% with 185 lines in your changes missing coverage. Please review.
✅ Project coverage is 2.16%. Comparing base (66f3c81) to head (0173f1c).
⚠️ Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
esp32_marauder/MarauderOuiSd.cpp	0.00%	100 Missing ⚠️
esp32_marauder/MenuFunctions.cpp	0.00%	57 Missing ⚠️
esp32_marauder/WiFiScan.cpp	0.00%	15 Missing ⚠️
esp32_marauder/MarauderOui.cpp	92.02%	2 Missing and 9 partials ⚠️
test/test_oui_lookup/test_main.cpp	98.93%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           develop   #1436      +/-   ##
==========================================
+ Coverage     0.40%   2.16%   +1.76%     
==========================================
  Files           20      24       +4     
  Lines        17176   17662     +486     
  Branches        11      52      +41     
==========================================
+ Hits            69     382     +313     
- Misses       17103   17266     +163     
- Partials         4      14      +10     

Flag	Coverage Δ
firmware-unit-tests	2.16% <62.85%> (+1.76%)	⬆️

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[Copilot]

Pull request overview

Adds an optional, SD-backed offline OUI (IEEE MAC prefix) label system so AP/station UI can display vendor/local/unknown classifications without changing scan/capture/log formats, plus tooling to build a deterministic binary OUI database.

Changes:

• Introduces a deterministic OUI database builder (tools/build_oui_database.py), documentation, and synthetic unit tests.
• Adds a native (Unity) test suite for the OUI lookup implementation.
• Integrates SD-backed OUI label rendering into AP info and station menu labels behind HAS_OUI_LABELS.

Reviewed changes

Copilot reviewed 12 out of 13 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tools/test_build_oui_database.py	Adds synthetic, network-free Python unit tests for the database builder and CLI behavior.
tools/OUI_DATABASE.md	Documents database provenance/licensing, usage, and the binary format.
tools/build_oui_database.py	Implements deterministic conversion from IEEE CSV registries into a compact binary OUI database, with optional explicit download mode.
test/test_oui_lookup/test_main.cpp	Adds Unity native tests covering database parsing, lookup behavior, and error handling.
platformio.ini	Updates the native test build filter to compile the OUI lookup implementation for the new tests.
esp32_marauder/WiFiScan.cpp	Displays OUI identity labels in AP detail output when HAS_OUI_LABELS is enabled.
esp32_marauder/MenuFunctions.cpp	Adds compact station menu labels using SD-backed OUI identification when enabled.
esp32_marauder/MarauderOuiSd.h	Introduces the SD-backed OUI database wrapper API and label helper declarations.
esp32_marauder/MarauderOuiSd.cpp	Implements SD-backed database open/read/lookup and label formatting.
esp32_marauder/MarauderOui.h	Introduces the core OUI database reader interface, classification enums, and lookup APIs.
esp32_marauder/MarauderOui.cpp	Implements header validation and longest-prefix binary search lookups over the compact database.
esp32_marauder/configs.h	Enables HAS_OUI_LABELS for a specific config block (alongside SD).
.gitignore	Ignores the generated marauder_oui.bin database artifact.

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[Copilot]

Pull request overview

Copilot reviewed 12 out of 13 changed files in this pull request and generated no new comments.

Suppressed comments (1)

tools/build_oui_database.py:154

• character.isspace() already catches U+0020 space, so the elif codepoint == 0x20 branch is unreachable. Keeping dead code makes the normalization logic harder to reason about and maintain.

        if 0x21 <= codepoint <= 0x7E:
            output.append(character)
        elif codepoint == 0x20:
            output.append(" ")
        else: