chore: Add is_alumni attribute to Member object

[AnandajithS]

This PR introduce the 'is_alumni' attribute to the 'Member' object to keep track of members who have graduated

• Added a view called active_members which filters out alumni by selecting rows where 'is_alumni' is set to false

• Updated the queries accordingly to make use of `active_members'

Closes #155

[Copilot]

Pull Request Overview

This PR adds alumni tracking functionality to the Member model by introducing an is_alumni boolean attribute and creating a database view to filter active members.

• Added is_alumni boolean field to the Member model with a default value of false
• Created active_members database view that filters out alumni (where is_alumni = false)
• Updated all member-related queries to use the active_members view instead of querying the Member table directly

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
migrations/20251103160042_add_alumni_attribute.sql	Adds the is_alumni column to the Member table and creates the active_members view
src/models/member.rs	Adds is_alumni field to Member struct and UpdateMemberInput struct
src/graphql/mutations/member_mutations.rs	Updates INSERT and UPDATE queries to include the is_alumni field
src/graphql/queries/member_queries.rs	Updates member queries to use active_members view instead of Member table
src/graphql/mutations/status_mutations.rs	Updates status mutation query to use active_members view
src/daily_task/mod.rs	Updates daily task query to use active_members view
src/database_seeder/seed.sql	Updates seed data to include is_alumni values (alternating true/false pattern)

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