feat(BE): approval_workflow, adjusment project_flocks, common, and migration

internal/database/migrations/20251015162158_create_approvals_table.down.sql

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+DROP INDEX IF EXISTS approvals_approvable_lookup;
+DROP TABLE IF EXISTS approvals;

internal/database/migrations/20251015162158_create_approvals_table.up.sql

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+CREATE TABLE approvals (
+    id BIGSERIAL PRIMARY KEY,
+    approvable_type VARCHAR(50) NOT NULL,
+    approvable_id BIGINT NOT NULL,
+    step SMALLINT NOT NULL,
+    status VARCHAR(20) NOT NULL,
+    notes TEXT,
+    created_at TIMESTAMPTZ DEFAULT NOW() NOT NULL,
+    action_by BIGINT REFERENCES users (id) ON DELETE SET NULL ON UPDATE CASCADE
+);
+
+CREATE INDEX approvals_approvable_lookup ON approvals (approvable_type, approvable_id);

internal/database/migrations/20251017071755_rename_approval_status_to_action.down.sql

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+ALTER TABLE approvals
+    RENAME COLUMN action TO status;
+
+UPDATE approvals
+SET status = 'PENDING'
+WHERE status IS NULL;
+
+ALTER TABLE approvals
+    ALTER COLUMN status SET NOT NULL;
+
+ALTER TABLE approvals
+    RENAME COLUMN step_number TO step;
+
+ALTER TABLE approvals
+    DROP COLUMN step_name;
+
+ALTER TABLE approvals
+    RENAME COLUMN action_at TO created_at;

internal/database/migrations/20251017071755_rename_approval_status_to_action.up.sql

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+ALTER TABLE approvals
+    RENAME COLUMN status TO action;
+
+ALTER TABLE approvals
+    ALTER COLUMN action DROP NOT NULL;
+
+ALTER TABLE approvals
+    RENAME COLUMN step TO step_number;
+
+ALTER TABLE approvals
+    ADD COLUMN step_name VARCHAR NOT NULL;
+
+ALTER TABLE approvals
+    RENAME COLUMN created_at TO action_at;