feat: Add table for ABC-like (#2840)

[KATO-Hiro]

close #2840

Summary by CodeRabbit

• Documentation

  • Enhanced guide for adding contest table providers with concrete implementation steps, examples, test guidance, and updated references.

• New Features

  • Added ABC‑Like contest provider and expanded contest recognition to include Tenka1 (2017, 2019) and CADDi 2018.
  • Broadened public contest/task dataset with many new contest entries.

• Tests

  • Expanded test fixtures and coverage for contest providers, task results, and ABC‑Like/ARC‑Like scenarios.

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[coderabbitai]

Walkthrough

This pull request adds an ABCLikeProvider and registers an "ABC-Like" provider group, extends ARC_LIKE contest mappings (tenka1-2017, tenka1-2019, caddi2018), augments task and contest-task datasets, expands tests for ABC-Like behavior, and updates documentation with concrete provider/test guidance.

Changes

Cohort / File(s)	Summary
Provider implementation & mappings src/lib/utils/contest.ts, src/lib/utils/contest_table_provider.ts	Add ARC_LIKE entries for tenka1-2017, tenka1-2019, caddi2018; implement ABCLikeProvider (filtering, metadata, display config, round label parsing); register ABC-Like in presets and contestTableProviderGroups.
Test suites & mocks src/test/lib/services/task_results.test.ts, src/test/lib/utils/contest_table_provider.test.ts	Extend mock tasks with many ABC_LIKE/ARC_LIKE entries; add tests exercising ABCLikeProvider filtering, metadata/display, round labels, table generation, and cross-contest scenarios.
Test cases / fixtures src/test/lib/utils/test_cases/contest_table_provider.ts, src/test/lib/utils/test_cases/contest_type.ts	Add taskResultsForABCLikeProvider export aggregating many ABC-Like contest task results; include arc-like test cases for tenka1-2017, tenka1-2019, caddi2018.
Data augmentation prisma/contest_task_pairs.ts, prisma/tasks.ts	Add numerous new contest-task pair entries and many new task records across contests (e.g., jsc2025advance-final, tenka1 series, abc422, zone2021, sumitrust2019, etc.).
Documentation docs/guides/how-to-add-contest-table-provider.md	Expand guide with concrete implementation steps, provider registration/export instructions, skeleton examples, test design patterns, and updated references.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

Poem

🐰 I hopped through code to add a new lane,
ABC-Like contests now join the train.
Tenka, CADDi, many tasks in sight,
Filters, labels, tests all working right.
Hop-hop—tables bloom beneath the moonlight! 🥕🐇

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: adding a table for ABC-like contests, which is reflected in the new ABCLikeProvider class and related contest table updates.
Linked Issues check	✅ Passed	The PR implements the feature to add an ABC-like table [#2840] by introducing ABCLikeProvider, registering it in contest provider presets, and adding comprehensive test coverage for ABC-like contest filtering and display.
Out of Scope Changes check	✅ Passed	All changes are within scope: new provider implementation, contest mappings, task data augmentation, and test coverage directly support the ABC-like table feature requested in #2840.

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✨ Finishing touches

• 📝 Generate docstrings

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[coderabbitai]

Actionable comments posted: 4

🤖 Fix all issues with AI agents

In `@docs/guides/how-to-add-contest-table-provider.md`:
- Around line 80-81: Update the broken relative links in
docs/guides/how-to-add-contest-table-provider.md that currently use "../src/..."
so they point to the repository root src directory by using "../../src/..."
(i.e., change the link targets from "../src/..." to "../../src/..."); search for
all occurrences of the "../src/" pattern (including the instances referenced
around the Provider implementation link and the other occurrences noted) and
adjust them to "../../src/" so they resolve correctly from the docs/guides
directory.
- Around line 283-294: Replace the bolded step labels (**ステップ1: データソース確認**,
**ステップ2: ContestType 確認**, **ステップ3: テストデータ構築**) with proper Markdown headings
(e.g., "### ステップ1: データソース確認", etc.) so they are recognized as section headers by
markdownlint MD036; ensure the content under each heading remains unchanged and
keep references to the files and symbols mentioned (prisma/tasks.ts,
prisma/contest_task_pairs.ts, prisma/schema.prisma, src/lib/types/contest.ts,
classifyContest(), ContestType) so links/searches still find them.

In `@prisma/tasks.ts`:
- Around line 7889-7914: Update the inconsistent task id prefixes for the CADDi
2018 Beginners entries: change the ids currently set as 'caddi2018_a' and
'caddi2018_b' (the entries with name 'Product and GCD' and 'Harlequin') to use
the 'caddi2018b_' prefix so they match the rest of the contest (e.g.,
'caddi2018b_c' and 'caddi2018b_d' as appropriate); modify only the id fields in
the task objects so test expectations (which expect 'caddi2018b_*') and task
lookup/merge logic align with the other contest entries ('caddi2018b_a',
'caddi2018b_b', etc.).

In `@src/test/lib/services/task_results.test.ts`:
- Around line 283-299: The mock entry for id '24' uses the wrong task id/index
for ABC422; replace the incorrect 'task_id: "abc422_h"' and 'task_table_index:
"H"' with the correct ABC422 values (e.g., 'task_id: "abc422_g"' and
'task_table_index: "G"') in the test data in task_results.test.ts so the mock
matches real contest layout and avoids masking mismatches.

[KATO-Hiro]

LGTM