refactor(structure): promote app to repo root + remove redundant workspace cruft

Standard production layout: the OKR app (was nested under AINative_OKR_CASAN5/) is now
the repository root. No more wrapper directory.

- Promote AINative_OKR_CASAN5/* -> repo root (backend/ frontend/ packages/ apps/
  .specify/ docs/ infra/ nginx/ scripts/ + configs). Merge tool dirs: .gitea (kept the
  active deploy ci.yml, added harness-ci.yml + runbooks), .claude (agents/commands +
  launch.json), .github moved up.
- Remove redundant: 00_SUBMISSION_PACKAGE, scattered root notes (FPT_CASAN_Full.md,
  tu-tuong-casan.md, casan-tu-sinh..., casan_harness_assessment.md, source-review...,
  README_CASAN5_REFINED.md), casan-next-plans/ and optimize-docs/ (competition/planning
  artifacts — roadmap + design history preserved in git log / commit messages).
- Update all references to the old layout:
  - .gitea/workflows/{ci,harness-ci}.yml, .github/workflows/{ci,deploy}.yml:
    working-directory .; drop AINative_OKR_CASAN5/ prefix; .specify/{tests,scripts}
    -> packages/casan-harness/... (.specify/logs state kept)
  - .claude/launch.json, .gitea/*-runbook.md: path prefixes
  - CLAUDE.md, README.md: docs/input -> apps/okr/domain/input
  - policy-bundle.yaml: 8 policy paths -> packages/casan-harness/...; manifest re-signed
- secrets-scan.sh: fixture excludes -> new package/domain paths.

Full gate from the new root: PASS=64 FAIL=0 SKIP=3.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

backend/prisma/migrations/202606280001_init/migration.sql

@@ -0,0 +1,65 @@
+-- MySQL initial schema for OKR application
+CREATE TABLE `User` (
+    `id` INT NOT NULL AUTO_INCREMENT,
+    `name` VARCHAR(191) NOT NULL,
+    `username` VARCHAR(191) NOT NULL,
+    `email` VARCHAR(191) NOT NULL,
+    `passwordHash` VARCHAR(191) NOT NULL,
+    `role` VARCHAR(191) NOT NULL,
+    `createdAt` DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
+    `updatedAt` DATETIME(3) NOT NULL,
+    PRIMARY KEY (`id`),
+    UNIQUE INDEX `User_username_key`(`username`),
+    UNIQUE INDEX `User_email_key`(`email`)
+) DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
+
+CREATE TABLE `Objective` (
+    `id` INT NOT NULL AUTO_INCREMENT,
+    `title` VARCHAR(191) NOT NULL,
+    `description` VARCHAR(191) NULL,
+    `ownerId` INT NOT NULL,
+    `quarter` VARCHAR(191) NOT NULL,
+    `status` VARCHAR(191) NOT NULL DEFAULT 'NOT_STARTED',
+    `createdAt` DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
+    `updatedAt` DATETIME(3) NOT NULL,
+    INDEX `Objective_ownerId_idx`(`ownerId`),
+    INDEX `Objective_quarter_idx`(`quarter`),
+    INDEX `Objective_status_idx`(`status`),
+    PRIMARY KEY (`id`)
+) DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
+
+CREATE TABLE `KeyResult` (
+    `id` INT NOT NULL AUTO_INCREMENT,
+    `objectiveId` INT NOT NULL,
+    `title` VARCHAR(191) NOT NULL,
+    `progress` INT NOT NULL DEFAULT 0,
+    `startValue` INT NOT NULL,
+    `targetValue` INT NOT NULL,
+    `deadline` DATETIME(3) NOT NULL,
+    `createdAt` DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
+    `updatedAt` DATETIME(3) NOT NULL,
+    INDEX `KeyResult_objectiveId_idx`(`objectiveId`),
+    PRIMARY KEY (`id`)
+) DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
+
+CREATE TABLE `ProgressUpdate` (
+    `id` INT NOT NULL AUTO_INCREMENT,
+    `keyResultId` INT NOT NULL,
+    `progress` INT NOT NULL,
+    `comment` VARCHAR(191) NULL,
+    `createdById` INT NOT NULL,
+    `createdAt` DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
+    PRIMARY KEY (`id`)
+) DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
+
+ALTER TABLE `Objective` ADD CONSTRAINT `Objective_ownerId_fkey`
+    FOREIGN KEY (`ownerId`) REFERENCES `User`(`id`)
+    ON DELETE RESTRICT ON UPDATE CASCADE;
+
+ALTER TABLE `KeyResult` ADD CONSTRAINT `KeyResult_objectiveId_fkey`
+    FOREIGN KEY (`objectiveId`) REFERENCES `Objective`(`id`)
+    ON DELETE CASCADE ON UPDATE CASCADE;
+
+ALTER TABLE `ProgressUpdate` ADD CONSTRAINT `ProgressUpdate_keyResultId_fkey`
+    FOREIGN KEY (`keyResultId`) REFERENCES `KeyResult`(`id`)
+    ON DELETE CASCADE ON UPDATE CASCADE;