Feature/ Sessions fully implemented

[RileyTripcony]

Made body_insight table 1:1 relation with activity table. Add error message when trying to create body_insight data when already exists for activity.

Add fields for steps, floors and zone_mintues to activity table.

Also retains previous PR to change dashboard endpoint to get VO2 from database.

Created sleep_data table. Created sleep_data endpoint methods

Created sessions//details to return all information regarding the chosen id. activity data, body_insight data, sleep_data.

[github-actions]

🔒 Security Scan Results

🔒 Security Scan Results
=========================

Bandit Scan Results:
-------------------
Run started:2025-09-14 11:48:00.119247

Test results:
	No issues identified.

Code scanned:
	Total lines of code: 1180
	Total lines skipped (#nosec): 0
	Total potential issues skipped due to specifically being disabled (e.g., #nosec BXXX): 0

Run metrics:
	Total issues (by severity):
		Undefined: 0
		Low: 14
		Medium: 0
		High: 0
	Total issues (by confidence):
		Undefined: 0
		Low: 0
		Medium: 0
		High: 14
Files skipped (0):

Dependency Check Results:
-----------------------

✅ No critical security issues detected.

The code has passed all critical security checks.

[jd-deakin]

Change looks okay.
This will be fine in a dev environment.

Fixed user ID's would not be ready for production.
Error handling is good.

[github-actions]

🔒 Security Scan Results

🔒 Security Scan Results
=========================

Bandit Scan Results:
-------------------
Run started:2025-09-24 08:00:22.725621

Test results:
	No issues identified.

Code scanned:
	Total lines of code: 1365
	Total lines skipped (#nosec): 0
	Total potential issues skipped due to specifically being disabled (e.g., #nosec BXXX): 0

Run metrics:
	Total issues (by severity):
		Undefined: 0
		Low: 14
		Medium: 0
		High: 0
	Total issues (by confidence):
		Undefined: 0
		Low: 0
		Medium: 0
		High: 14
Files skipped (0):

Dependency Check Results:
-----------------------

✅ No critical security issues detected.

The code has passed all critical security checks.

[ben-AI-cybersec]

lgtm